Built-in sealing medium throttling control device for dynamic and static pressure dry gas seals

Abstract

The invention discloses a built-in sealing medium throttling regulation and control device for a dynamic and static pressure type dry gas seal. The device is installed in a gland cover. A first annular boss and a second annular boss are machined in an axial step through hole, a first sealing gas chamber is formed between the two bosses, a second sealing gas chamber is formed between a flange and the second annular boss, a first gas hole is formed between the first sealing gas chamber and a sealing chamber, the second sealing gas chamber communicates with a static ring back chamber through a second gas hole, and sealing gas enters a pressure equalizing groove in a sealing end face from the static ring back chamber through a static ring throttling hole. An axial blind hole is formed in the end, close to a gasket, of a valve plug, a spring is installed in the blind hole, and the spring is located between the valve plug and the gasket; a throttling port is formed by the other end of the valve plug and the second annular boss, an ejector rod is installed at the end of a wedged surface, the other end of the ejector rod is supported by a nut, and the nut is installed on the flange and is concentric with the axial step through hole. The axial position of the valve plug is changed by adjusting the nut so that the opening degree of the throttling port can be changed, and regulation and control on the pressure and the flow of the gas in the pressure equalizing groove in the end face of the dry gas seal are achieved.

Description

(1) Technical field [0001] The invention relates to the design field of dynamic and static pressure combined dry gas seal structure, in particular to a dynamic and static pressure combined dry gas seal structure with a built-in sealing medium throttling control device, especially suitable for rotating equipment at low speed or under variable working conditions shaft end seal. (2) Background technology [0002] Dry gas seal is a kind of rotary sealing device. Because of its characteristics of no liquid, low leakage, environmental protection, energy saving and long life, researchers try to use dry gas seal in more dynamic seals of rotating machines. However, through practice and theoretical analysis, it is found that the stability of the dry gas seal depends to a large extent on the speed of the unit, because the dry gas seal requires non-contact operation with a small gap, and to form the required small gap, it must be The unit to be sealed has a sufficiently high rotational...

AI Technical Summary

Problems solved by technology

However, there are still many key issues to be solved on how to control the pressure of the sealing medium, reduce the leakage, and improve the adaptability of the dry gas sealing structure to changes in speed and pressure.

In addition, the dynamic and static pressure mechanical seal structures currently used at home and abroad generally require additional buffer media, which not only increases the complexity of the sealing structure, but also increases the cost of the entire sealing device, and the pressure of the sealing medium is affected by more external factors. influences

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