1. Sealing at Casing Flange Connections
- Casing consists of multiple bolted sections; flange joints are critical leak‑prevention points.
- An oil‑ and corrosion‑resistant rubber or asbestos gasket is inserted between flange faces.
- High‑strength bolts tightly clamp flanges, causing the gasket to deform elastically.
- This fills microscopic irregularities, effectively blocking dust from escaping through joints.
2. Shaft‑End Sealing for Drive & Tensioning Shafts
- Dynamic sealing required where head drive shaft and tail tensioning shaft exit the casing.
- Common configurations: labyrinth seals (tortuous gap increases airflow resistance) or radial shaft seals (oil seals).
- Radial shaft seals achieve a physical barrier via tight contact between the lip and shaft surface.
- For stringent applications, multi‑layer sealing structures ensure zero leakage at shaft ends.
3. Flexible Connections at Inlet & Discharge Ports
- Inlet and discharge ports connect to upstream/downstream equipment; rigid connections risk seal failure.
- Flexible connections (e.g., canvas, rubber, or silicone expansion joints) are used at interfaces.
- Accommodates minor vibrations and thermal expansion during operation.
- Isolates internal airflow from the environment, preventing dust from blowing out due to positive pressure.
4. Clamped Sealing for Access Doors & Observation Windows
- Access doors and observation windows require reliable sealing for maintenance convenience.
- Embedded gasket combined with a quick‑clamping mechanism is used.
- A groove around the door frame holds a resilient silicone rubber gasket.
- When closed, clamping force compresses the gasket to fill gaps, ensuring a dust‑tight seal while allowing easy opening.
