Stuffing box device of crosshead two-stroke diesel engine

Abstract

The invention discloses a stuffing box device of a crosshead two-stroke diesel engine; the stuffing box device comprises a piston rod and a stuffing box, wherein the stuffing box comprises a casing, the casing is composed of an upper half portion, a lower half portion and a flange, and the upper half portion is connected with the lower half portion; two layers of annular cavities are formed in the inner surface of the upper half portion in the axis direction from top to bottom in sequence, wherein an oil scraper ring and a first gas ring seal combination are sequentially arranged in the first layer annular cavity, and an oil discharge hole I is formed in the cavity wall of the cavity; a second gas ring seal combination is arranged in the second layer annular cavity; four layers of oil scraper rings are arranged inside the lower half portion in sequence, at least one annular spring arc groove is formed in each of the circumferential surfaces of a sealing outer ring and an oil ring, the oil ring is bound to an excircle of the piston rod through springs arranged in the spring arc grooves and is imbedded in the annular cavities. The stuffing box device of the crosshead two-stroke diesel engine is good in the sealing performance, convenient for detecting working property of all the rings, simple in mount and demount and low in repair cost.

Description

technical field [0001] The invention relates to a piston rod stuffing box of a crosshead two-stroke diesel engine, in particular to a piston rod stuffing box on a marine diesel engine, and belongs to the technical field of diesel engines. Background technique [0002] Low-speed diesel engines are widely used as main engines of large ships due to their advantages such as low speed, good economy, low fuel consumption, high power, simple and reliable structure, long life, and low-quality fuel. The piston rod of this type of diesel engine is connected to the connecting rod through a crosshead device to transmit the force. At the same time, a cylinder block scavenging box is installed on the upper part of the frame to isolate the crankcase from the upper cylinder block. However, in order to ensure that the piston rod can pass through, the There is a through hole at the bottom of the scavenging air box, and a stuffing box is installed in the hole. The main functions of the stuffi...

AI Technical Summary

Problems solved by technology

[0003] At present, the following problems generally exist in the stuffing box: (1) The sealing performance of the air ring in the stuffing box is not good, which cannot effectively solve the problem that the air in the scavenging box enters the crankcase, resulting in insufficient air in the scavenging box, resulting in insufficient combustion of the engine, affecting Burst pressure, resulting in large power loss, affecting engine performance

(2) When the diesel engine is working, judge the sealing performance of the sealing ring by observing whether there are bubbles in the inspection funnel connected to the stuffing box drain pipe. At the same time, when the amount of oil leaked into the inspection funnel exceeds the standard of 5-10L*24h, It can be considered that the oil wiper ring inside the stuffing box also has wear problems, but this detection method is time-consuming and laborious, and cannot report the problems of the seal ring and oil wiper ring in a timely and effective manner

(3) The wear inspection of the oil wiper ring of the stuffing box is often judged according to the oil scraping volume of a special detection ring in the stuffing box. If the oil volume of the detection ring is large, it means that the oil scraper ring has failed and needs to be replaced; This method relies on manual experience, cannot solve the problem accurately and effectively, and often misses the best time for replacement, causing the oil in the crankcase to enter the scavenging box, and the oil in it may enter other air rings, affecting the performance of the air rings sealing effect

(4) The known stuffing box is basically a one-piece structure. When replacing the stuffing box, the disassembly process is complicated, and the maintenance and disassembly need to be completed on a separate platform. The maintenance is not convenient, and whether it is the oil ring or the gas ring is invalid. If it needs to be replaced, the entire stuffing box assembly needs to be pulled out for inspection and maintenance, and the repair process is poor; in the traditional design, the entire stuffing box shell, the internal sealing ring and the oil wiper ring need to be replaced after the failure and damage of the stuffing box shell, and the maintenance cost is high

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