The dry gas seal dry gas seal is a non-contact mechanical seal that combines “hydrogen-sealed gas†and fluid dynamic and static pressure. It is the most advanced generation of high-speed turbo compressor shaft seal type in the world. The sealed structure is similar to the ordinary mechanical seal. The difference is that the moving and static ring seals have a wide end face, and a special shape groove is formed on the moving ring, such as a widely used single row or double row spiral groove, and the groove depth is generally Between 3 and 10 μm, the groove is generally engraved on a rigid moving ring. When the moving ring rotates, the gas is pumped into the sealing end face by the flow cell, and a gas film having a thickness of 3.0 to 5.0 μm is formed between the sealing faces of the sealing faces, and the sealing faces are separated to keep the sealing non-contact operation. Although the film thickness of the dry gas seal is small, the film stiffness is extremely large. Once the external interference occurs, the gap between the two seal faces increases or decreases, and it can quickly return to the original equilibrium position, that is, it has strong resistance to external interference. Ability.
The gas-rich compressor adopts a double-face dry gas seal structure. The process flow of its measurement and control system is as follows. (1) System nitrogen flow: After the nitrogen from the system enters the gas storage tank, the pressure of the dry gas sealing system is controlled to 0.6 by the pressure control valve. ◆ Use the maintenance fan technology to 0.7MPa, and then enter the dry gas through the buffer tank and the check valve. Sealed system control cabinet. (2) Main sealing process: After the system nitrogen enters the control cabinet, it first passes a coarse filter with a precision of 10 μm and a fine filter with an accuracy of 1 μm. If the system nitrogen pressure is low, the system nitrogen is filtered and then passed through the high and low pressure end flowmeters to enter the main seal chamber. If the system nitrogen pressure can meet the requirements, the system can directly enter the main seal chamber through the high and low pressure end flow meters after nitrogen filtration. (3) Pre-sealing process: After the nitrogen gas passes through the filter with the precision of 5μm, it enters the buffer air cavity between the main seal and the rich gas through the sonic orifice plate to prevent the rich gas from polluting the sealing body and destroying the normal operation of the seal. The sonic orifice plate can control the buffer gas consumption within /h. (4) Post-sealing process: After the instrument wind from the system is filtered, it enters the rear sealing cavity between the main seal and the bearing through the sonic orifice plate to prevent the lubricating oil from entering the sealing end face and destroying the normal operation of the seal.
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