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nature : also known as dynamic viscosity seal. Non-contact sealing a is a dynamic seal. Its structure and working principle is : the request for sealed parts of the shaft wall or hole into a spiral groove processing plans such as (a), can also pore axis and simultaneously processed into spin to the contrary composite spiral groove figure (b), spiral chutes filled with a viscous liquid oils, pivot, the spiral groove the viscous fluid pumping up spinning the role, if pump pressure head with the sealed medium pressure balance, on the realization of the media to prevent leakage sealing effect. Its advantages are : non-contact seal, without friction, allowing a larger enclosed space, long life, easy to maintain and repair, sealing effect, and particularly applicable to gas seal; Under the conditions of the low pressure (pressure of less than 1-2 MPa) sealed gas leak is very small, viscous fluid sealing without cycle cooling, the structure is very simple. Weaknesses : inappropriate under the conditions of high-pressure gas seals; Also unsuitable for high-speed sealed under the conditions, airflow easily emulsified effect; Stopping not seal; The temperature is not too high, otherwise the viscous fluid viscosity vulnerable. Many used the external environment exists dust sand dust sealed occasions.
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