Thin-Film Evaporator Rotor and Wiping System Detailed Explanation

The ​​rotor and wipers​​ are the ​​core transmission components​​ of a thin-film evaporator, directly determining the liquid film quality, heat transfer efficiency, and equipment stability. Below are the technical details:

1.Rotor System Composition​​

1.Main Shaft Structure​​:

• o Material​​: 316L stainless steel (standard), Hastelloy (highly corrosive conditions), titanium (chloride environments)
• o Support Method​​: Upper radial bearing + lower thrust bearing (withstands axial force)
• o Concentricity Requirement​​: ≤0.05 mm/m (prevents uneven wiper wear)

2.Drive Configuration​​:

• o Motor Type​​​​: Explosion-proof variable frequency motor (Ex d IIC T4)
• o Reduction Mechanism​​​​: Planetary gear reducer (torque ≥2000 N·m)
• o Sealing Type​​​​: Double mechanical seal (API 682 standard)

2.Wiper Types and Applications

3.Key Technical Parameters

1.Linear Speed Control​​:

• 1.o Standard Range​​: 2-15 m/s
• 2.o Low Speed​​ (2-5 m/s): High-viscosity materials (>10,000 cP)
• 3.o High Speed​​ (10-15 m/s): Low-viscosity materials (<100 cP)

2.Wiper Pressure Adjustment​​:

• o Spring Pressure​​: 0.1-0.5 Mpa (adjustable)
• o Hydraulic Pressure​​: 0.5-3.0 Mpa (high-viscosity conditions)

3.Wear Resistance Design​​:

• 1.o Wiper Blade Material​​: Tungsten carbide coating (hardness ≥HRA 90)
• 2.o Shell Lining​​: Replaceable stainless steel liner (thickness ≥6 mm)

4.Special Design Variants

1.Multi-Layer Wiper Structure​​:

• o Staggered upper and lower wipers achieve ​​secondary liquid film distribution​​ (improves heat transfer efficiency by 15-30%)

2.Eccentric Rotor System​​:

• o Rotor and shell installed eccentrically to create ​​variable gap shear​​ (suitable for crystallization-prone materials)

3.Heated Rotor​​:

• o Thermal oil circulated through the main shaft for ​​double-sided heating​​ (used for ultra-high viscosity materials)

5.Maintenance and Monitoring​​

1.Online Monitoring Points​​:

1. o oVibration Monitoring​​: Shell-mounted vibration sensors (threshold ≤4.0 mm/s)
2. o Torque Monitoring​​: Motor current feedback indicates wiper resistance (clogging warning)
3. o Temperature Monitoring​​: Bearing temperature (≤80°C)

2.Routine Maintenance Items​​:

1. o Wiper Replacement​​​​: Required when blade wear >1 mm (typically every 500-2000 operating hours)
2. o Seal Inspection​​​​: Adjust mechanical seal if leakage >10 mL/h
3. o Concentricity Calibration​​​​: Check shaft straightness annually

6.Troubleshooting Guide