Mechanical seal erosion and its characters

The purpose of the erosion is to prevent impurities are accumulated, to prevent the air bag formed to maintain and improve lubrication, when the washed liquid temperature is low, both the cooling effect. Erosion of the main methods are as follows:

One, within the erosion

1, positive scour

Features: (1) utilization of the host to be sealed by the export side of the pump introduced through the pipe sealed chamber.

(2) Application: for cleaning fluid into the P1, slightly larger than P coolers, filters, etc. When the temperature is high or impurities, can be set in the pipeline.

2, anti-erosion

Features: (1) utilization of the host to be sealed, introduced by the export side of the pump seal chamber, after scouring through the pipeline to flow back into the pump inlet.

(2) Application: for cleaning fluid, and P

3, the whole washed

Features: (1) utilization of the host to be sealed by the export side of the pump through the pipeline the introduction of the sealed chamber, washed and then administered road to flow back into the pump inlet.

(2) Applications: cooling effect is better than the first two for the cleaning fluid, and P1 and P in and P out close to.

Second, the outer erosion

Characteristics: the introduction of outside the system compatible with the sealing medium cleaning fluid to the seal chamber erosion.

Application: outside the flush fluid pressure should be sealed 0.05 - 0.1mPA The, together for medium heat or solid particles of occasions. Scouring liquid flow should ensure that the heat away, the need to meet the needs of the erosion will not result in the erosion of the seals.

To this end, we need to control the flow rate of the seal chamber pressure and the erosion of general cleaning scouring liquid flow rate should be less than 5M / S; syrupy liquid containing particles to be less than 3M / S, the flow rate value, scouring liquid and the difference between the seal chamber pressure should be "0.5MPA, generally take 0.05 - 0.1mPA The desirable 0.1 - 0.2MP, double mechanical seal. Erosion of fluid into and discharge the location of the sealed chamber of the orifice should be set up around the seal faces, and should be close to the moving ring side in order to prevent the graphite ring erosion or deformation due to uneven cooling caused by temperature difference, as well as the accumulated impurities and coke, etc., can be tangential to the introduction of one or more points of erosion. When necessary, the washed liquid hot water or steam.