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Drilling mud agitator shaft seal

Drilling mud agitator reliable seal is an important thing. The oil leak caused by mud agitator seal, not only waste oil largely, but also pollute drilling fluid. Because of mixer shaft is the rotary motion, so its seal belong to dynamic seal.

The basic requirements to dynamic seal:

1 Seal should be reliable;

2 The structure of seal should be simple, easy to loading and unloading;

3 Seal service life should be long.

In the actual use, the most common dynamic seal have two kinds: packing seal and mechanical seal. Drilling mud agitator shaft belongs to low speed, low pressure, applicable is packing seal, the packing seal has the advantage of simple structure, easy to maintain and high reliability.

The following picture is the drilling mud agitator packing seal structure, it is composed of 1-bushing, 2-packing box, 3-O ring, 4-water leg, 5-packing ring, 6-gland, 7-holding down bolt, etc.

The principle of packing seal

About packing seal principle can do such description: the padding filled into  annular gap between mixer shaft and stuffing box, under the effect of gland force, produce radial compression force to the mixer shaft surface. Because of the packing contains lubricant, so there will produce a layer of thin liquid film when produce radial compression force to the mixer shaft surface. The layer of liquid film on the one hand make mixing shaft get lubrication, on the other hand avoid to leak liquid or exterior liquid permeate. This is the principle of the packing seal.

Although added some lubricant when manufacture padding, but the quantity is limited, because the lubricant still be consumed constantly, so only rely on the padding itself lubricant is not enough, so we should also add a lubricant device on the gland box, to meet the need of continuous lubrication.

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