Danfoss paper machine quantitative vane pump
Danfoss Fixed Displacement Vane Pumps for Paper Machines
Danfoss fixed displacement vane pumps are specifically engineered to meet the rigorous operational demands of the pulp and paper industry. Designed with precision and durability in mind, these pumps play a critical role in ensuring the stable and efficient operation of paper machine hydraulic systems, which are essential for processes such as stock preparation, pressing, calendering, and winding. Leveraging Danfoss’ decades of expertise in hydraulic solutions and the legendary performance of Vickers by Danfoss technology, these vane pumps deliver consistent flow rates, reliable pressure control, and long service life even in harsh industrial environments.
Core Technical Features
- Pressure-Balanced Modular Design: Adopting a pressure-balanced 12-vane system, the pumps effectively reduce flow pulsations and operational noise, minimizing interference with the paper machine’s precision processes. The modular structure enhances serviceability, allowing for easy maintenance and component replacement without extensive disassembly of the entire hydraulic system .
- Innovative Intra-Vane Cartridge Technology: Featured in series such as V and VQ, this industry-leading design ensures outstanding volumetric efficiency and extended operating life. The cartridge assembly can be quickly replaced, significantly reducing downtime and maintenance costs— a crucial advantage for paper mills where continuous operation is vital .
- Wide Displacement Range: Offering a comprehensive range of displacements (from 3 cc to 193 cc per revolution), Danfoss fixed displacement vane pumps can be precisely matched to the flow requirements of different paper machine sections, from small auxiliary systems to large main drive hydraulic circuits .
- High Pressure Capability: With continuous pressure ratings up to 210 bar (3,000 psi) and peak pressure resistance up to 262 bar (3,800 psi) for certain models (e.g., VQH series), these pumps can handle the high-load demands of paper machine operations, ensuring stable pressure output even during sudden load fluctuations .
- Excellent Environmental Adaptability: The pumps are designed to withstand the harsh conditions of paper mills, including high humidity, dust, and temperature variations. Models with nitrile seals and ductile iron housings (e.g., VQH series) offer superior resistance to seizure and wear, while excellent cold-start capability ensures reliable operation in low-temperature environments .
Key Specifications
| Series | Displacement Range | Continuous Pressure Rating | Max Speed | Max Operating Temperature | Mounting Type |
|---|---|---|---|---|---|
| Square Vane Pumps (V10/V20) | 3 – 42 cc/rev (0.2 – 2.6 cu in/rev) | Up to 172 bar (2,500 psi) | Varies by model | 210 °F (99 °C) | Flange |
| V Series | 7 – 193 cc/rev (1.1 – 11.6 cu in/rev) | Up to 207 bar (3,000 psi) | Up to 2,700 rpm | 210 °F (99 °C) | Flange, Foot |
| VQ Series | 18 – 193 cc/rev (1.1 – 11.8 cu in/rev) | Up to 210 bar (3,000 psi) | Up to 2,700 rpm | 210 °F (99 °C) | Flange |
| 2520V Double Pump | 36.1 – 55.7 cm³/rev | 207 bar (3,000 psi) | 1,800 rpm | 210 °F (99 °C) | Flange |
Application in Paper Mills
Danfoss fixed displacement vane pumps are integral to various key processes in paper production, providing stable hydraulic power for critical operations:
- Stock Preparation: Used in hydraulic systems for pulp mixing, refining, and screening equipment, ensuring consistent flow and pressure to maintain pulp quality .
- Paper Machine Main Drive: Deliver precise hydraulic power to the main drive system, enabling smooth speed control of the paper web and ensuring uniform paper thickness.
- Pressing Section: Provide reliable pressure for the press rolls, which is essential for dewatering the paper web efficiently and improving paper strength.
- Calendering and Winding: Ensure accurate pressure control in calendering rolls (for smooth paper surface) and winding systems (for tight, uniform paper rolls), reducing paper defects and waste.
- Auxiliary Systems: Serve as pilot or auxiliary pumps for complex hydraulic circuits, such as lubrication systems and valve control, supporting the overall reliability of the paper machine .
Maintenance Guidelines
- Fluid Filtration: To ensure satisfactory service life, use full-flow filtration to maintain hydraulic fluid cleanliness at ISO Code 16/13 or cleaner. Danfoss recommends OFP, OFR, and OFRS series filters .
- Seal Installation: Assemble seals with the spring-loaded sealing member facing the bearing. Ensure all seals are completely wetted with oil prior to installation to prevent damage .
- Bolt Torque: Follow specified torque values during assembly (e.g., 88.1 – 101.7 N·m for 38523 bolts, 55.2 – 67.8 N·m for 1296 bolts) to ensure proper sealing and component integrity .
- Regular Inspection: Periodically check for oil leaks, abnormal noise, and temperature rises. Replace worn components (e.g., vanes, rotors, seals) with genuine Danfoss cartridge kits to maintain pump performance .
With a legacy of over 100 years in hydraulic solutions, Danfoss fixed displacement vane pumps combine legendary reliability with advanced technology, making them the preferred choice for paper mills worldwide. These pumps not only enhance the operational efficiency of paper machines but also reduce lifecycle costs through minimal maintenance and extended service life.
