As the "command center" of a vacuum drum filter, the gas distribution disc is a fixed multi-channel disc valve. Its core mission is to coordinate with the rotation of the drum and accurately deliver the two "power commands"—vacuum from the vacuum box and compressed air—to the filter chamber that is currently at the responsive workstation. This precise gas distribution process relies on the airtight cooperation between the distributor head (which rotates synchronously with the drum) and the surface of the fixed gas distribution disc. This ensures the continuous and cyclic operation of the four stages: filtration, washing, dewatering, and discharging.

Core Functions: Gas Path Switching and Process Control

As the control core of the vacuum drum filter, the gas distribution disc ensures each filter chamber on the drum sequentially performs the following operations through its internally precise gas path zoning:

Filtration Zone: The gas distribution disc connects to the vacuum pipeline, allowing the filtrate to be suctioned in. Solid particles are adsorbed on the drum surface and form green tea cakes.

Washing Zone: It guides the washing liquid to pass evenly through the filter cake layer, and suctions away the waste liquid after the washing process is completed.

Dewatering Zone: High vacuum degree is maintained continuously to deeply remove the mixed liquid from the filter cake, achieving further drying.

Discharging Zone: The gas path is switched to compressed air, and the airflow is used to blow the dried filter cake off the filter cloth. A scraper needs to be used in conjunction to ensure clean discharging.

Key Structural Features

The structural design of the gas distribution disc is directly associated with its filtration efficiency and operational stability, with its main features reflected in three aspects:

Clear Zoning: The disc surface is precisely divided into multiple independent fan-shaped gas path zones, which correspond to process stages such as filtration, washing, dewatering, and discharging respectively. This ensures accurate and orderly gas path switching during each stage.

Tight Sealing: High-precision seals are used between the disc and the rotating distributor head, effectively preventing cross-talk between the vacuum and compressed air circuits. This guarantees the stability of the system’s vacuum degree and the smoothness of the discharging action.

Wear-Resistant Material: The gas distribution disc is mostly made of stainless steel, special alloys, or high-strength cast iron with surface hardening treatment. It exhibits excellent wear resistance and corrosion resistance, enabling it to withstand long-term rotational friction and erosion under complex working conditions.

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