Piston compressor
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What is the sequence for air recovery and nitrogen filling in the piston compressor packing box? Is the nitrogen filling port on the outside?
The structural arrangement of this packing seal assembly should be such that the mixed gas resulting from the leakage of the process gas and the sealing gas is led out. Achieves a sealing effect. The main purpose is to prevent accidents caused by the contact between leaked gas and lubricating oil. In such sealing structures equipped with sealing gas, the compressed gas is usually a flammable and explosive medium; the mixture is located in an intermediate position, and its pressure is lower than the leakage pressures of both the sealing gas and the compressed gas. For reference.
Generally, the nitrogen injection port is located on the outermost side, and the pressure there is higher than the pressure of the medium leaking out; this is done to prevent the medium from leaking into the intermediate cylinder. The second-to-last port is used for venting – the leaking medium mixes with nitrogen through this port and is then diluted before being released into the venting system.
Purging nitrogen enters between the two sets of nitrogen sealing rings; the nitrogen inlet is located in front of the leak recovery port, which is where the mixture of nitrogen and the process gas leaks out