Issues regarding the internal structure of centrifugal compressors
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I’m seeking advice from experts. This is the cross-sectional view of the centrifuge here, and I don’t quite understand its internal structure. What is the purpose of the black circle in the second diagram? Also, does my compressor not have a balance disk? I understand what a thrust disk is, but I’ve never understood where the balance disk is located. Additionally, how are the impeller blades fixed to the shaft? And how is there a seal between the blades and the shaft, as shown in the diagram?
Impeller front cover plate, inlet, and air seal; the outer diameter of the impeller’s outer wheel is 400.
An inter-stage gas seal prevents high-pressure gas from the next stage from flowing back into the inlet of the previous stage’s impeller. There is also a balance drum; the area with the gas seal on the right side, as mentioned by the person above, refers to this balance drum. The blades of the impeller are fixed between the two cover plates of the impeller, which in turn is mounted on the shaft. The seal ring at the impeller’s inlet prevents gas from flowing back, and a labyrinth seal is used for this purpose
Is the balance disk on the right side of the impeller? Is it also called a balance hub?
After listening to your explanation, everything became clear to me; I’m truly very grateful. I have one more question: by \"balance hub,\" do you mean a balance disc? So how does the balance hub counteract the axial force? May I understand it this way: the purpose of the flat surface and the hub is to prevent the pressure difference across the impeller from acting on the impeller itself?
Balance the axial force and reduce the axial force on the thrust main bearing; generally, 70% of this force can be balanced
In the second diagram with the black circle, the part on the right side is part of the impeller; together with the element on the right outside the black circle, they form a complete impeller
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