What is the disk of the compressor rotor used for?
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What is the disc on the rotor shaft head of the unit used for? Is it a displacement measuring plate?
This disk does not look like the rotor part, but like the shaft seal baffle on the bearing box? It's best to send a picture of the other side.
Axis displacement plate, used to measure axis displacement
From the picture, it seems that the dry gas seal of your compressor is a one-way grooved and sunken 2MCL machine, right? It doesn’t feel too big and is relatively clean, much like the compressor of a gas separation device.
Taking into account both measuring shaft displacement and oil seal function
Why does it look so rough? The displacement plate has a finishing surface