Changsha Roots fan sealing means of labyrinth sealing
Changsha Roots fan labyrinth seal relies on the slot gap is gas throttling, thereby reducing leakage, to achieve the purpose of sealing. Since there is no solid-phase friction, lubrication is not required, and power consumption is low, maintenance is simple, and service life is long.
Commonly used labyrinth seal structure, there are shallow teeth labyrinth and comb labyrinth two forms. Due to non-contact sealing, even if you increase the number of teeth of the labyrinth, take the means of pumping or inflatable, it is difficult to do without leakage.
1. Shallow tooth labyrinth. The labyrinth formed by the liner tooth groove and the sealing seat bore, the gas sealing effect. Labyrinth bushings are generally made of metal materials, in order to prevent friction of metal parts, the labyrinth is usually usually left at the top of a large gap.
In order to improve the sealing performance, PTFE with graphite is sometimes used to make labyrinth bushings. As Teflon has self-lubricating properties, so the labyrinth gap can be made very small, even if the top of the teeth and the sealing seat between the occurrence of slight friction, can also form a very small running gap. Can also be supplemented by inflatable means, to the middle of the labyrinth into the high-pressure gas, so that the two ends of the media are isolated from each other.
2. Comb labyrinth. Compared with the shallow tooth labyrinth, comb labyrinth sealing effect is good, but the structure is more complex. Assembly precision requirements are high, the teeth must be greater than the axial movement of the rotor spacing, otherwise it will occur “burning teeth” phenomenon. In order to improve the sealing effect, usually with the extraction tube will be in the middle of the labyrinth of the gas lead to the blower inlet, not when the extraction of gas can be screwed into the top of the extraction pipe to make it stop.
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