204 Mechanical seal The manufacturer teaches you the washing skills of sealing parts!

Technical features of mechanical seal scouring

The purpose of mechanical seal flushing is to prevent the accumulation of impurities, prevent the formation of air bags, maintain and improve lubrication, etc. When the flushing fluid temperature is low, it also has a cooling effect. Now Hengda Mechanical Seal will explain the technical features of mechanical seal flushing.

1. Internal scour

Positive flushing: the sealed medium of the working host is introduced into the sealing chamber from the outlet end of the pump through the pipeline. Mainly used for cleaning fluids. When the temperature is high or there are impurities, coolers, filters, etc. can be set on the pipeline.  

Backwash brush: the sealed medium of the working host is introduced into the seal chamber from the outlet end of the pump, and flows back to the pump inlet through the pipeline after flushing. Mainly used for cleaning fluids. Full flushing refers to the use of the sealed medium of the working host, which is introduced into the sealing chamber from the outlet end of the pump through the pipeline, and then flows back to the pump inlet through the pipeline after flushing. This method has good cooling effect.  

2. External flushing: clean fluid compatible with the sealed medium in the external system is introduced to the seal chamber for flushing. The pressure of external flushing fluid shall be 0.05-0.1MPA higher than that of the sealed medium, which is applicable to the occasions where the medium is high temperature or solid particles. The flow of flushing fluid shall ensure that it can take away heat, and meet the need of flushing, so as not to produce erosion on seals. Therefore, it is necessary to control the pressure of the seal chamber and the flow rate of the flushing fluid. Generally, the flow rate of the cleaning flushing fluid should be less than 5M/S; The slurry liquid containing particles must be less than 3M/S. In order to reach the above flow rate value, the difference between the flushing fluid and the pressure of the seal chamber should be ≤ 0.5MPA, generally 0.05-0.1MPA, and 0.1-0.2MP for double end mechanical seals. The orifice where the flushing fluid enters and exits the sealing chamber shall be set around the sealing end face and close to the moving ring side. In order to prevent the graphite ring from being eroded or deformed due to temperature difference due to uneven cooling, as well as the accumulation and coking of impurities, tangential introduction or multi-point flushing can be used. If necessary, the flushing fluid can be hot water or steam.