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Analysis of leakage mechanism of Explosion Proof Cable Gland

Aug. 05, 2019

Analysis of leakage mechanism of Explosion Proof Cable Gland

Cable packing box leakage, can be directly observed from the outside of the funnel, the following two aspects of analysis:

1. Internal cause

(1) quality of spare parts

· lack of tension;

· the inner and outer arcs of the oil scraping ring and sealing ring are not consistent with the outer circle of the piston rod;

· positioning pin and hole machining errors;

· there is no space between paragraphs;

· the sealing ring is too thin and the gap between the ring groove on the body is too large;

· the internal and external arc of the blade is significantly inconsistent with the piston rod external circle;

(2) abnormal conditions

· excessive wear of oil scraping ring and sealing ring, resulting in too small or no space between sections;

· the tension breaks or loses its elasticity;

· each group of rings is stuck in the ring slot;

· each set of rings only replaces the upper or lower part of the sealing ring;

· locating pin falls off;

Explosion Proof Cable Gland

Explosion Proof Cable Gland

2. External cause

(1) device quality

· stuffing box body of the Armored Cable Gland is not fully seated or deflected;

· the outer rubber ring of stuffing box body is damaged or there is no device;

· the two halves of the stuffing box body are not fastened on a horizontal line;

· the tension hook is broken or not connected;

(2) abnormal phenomena

· corrosion of piston rod (for example, the steam valve of scavenging air box steam blowing device for residual pipe is not closed);

· irregular wear of piston rod;

· the piston rod is not in alignment with the cylinder liner (such as the large gap between the crosshead guide plate);

3. Maintenance management

The working environment and condition of each ring of Explosion-proof Wiring Box are poor, especially the first group is the worst. Elucidates the book rule, every time the convention also should dismantle the inspection packing box when hanging the cylinder, the measurement all rings wears the condition, the point inspects the first group of rings and the following four groups scrapes the oil ring to scrape the slice, if wears close to the limit, has the necessity to carry on the substitution, and replaces together this group up and down two parts. If scraper exceeds limit, change scraper only can.

At ordinary times, look at the machine next to the packing box release tube funnel, if found in a cylinder funnel air clarify the first three groups of ring seal is not good, only the oil flow to clarify the four groups of scraping ring seal. As leakage continues to increase, crash replacement is necessary. The ability to collapse from the crank box into the site does not require the cylinder to collapse when the stuffing box.

Sometimes, after replacement of new spare parts, the leakage amount may be large at the beginning. In addition to the device factors, the main reason is that the inner appearance of each ring does not match with the outer circle of piston rod. After running in for a period of time, the leakage amount will gradually decrease.