ZKJ Series Vacuum Pressure Impregnation (VPI) Equipment

ZKJ Series Vacuum Pressure Impregnation (VPI) Equipment

1. Applications

Power & Electrical Industry (Core Application):

High/low-voltage motors, new energy vehicle drive motors, wind turbine generators, transformers (dry-type/power), instrument transformers, power capacitors, and high-voltage cable insulation treatment.

Electronic Components Industry:

Insulation encapsulation for inductors, magnetic cores, electronic transformers, relays, ballasts, and high-frequency power modules.

New Materials & Powder Metallurgy:

Oil impregnation for powder metallurgy oil-retaining bearings, resin impregnation for carbon/glass fiber composites (prepreg process), and sealing reinforcement for porous metal parts.

Other Industrial Applications:

Moisture-proof insulation treatment for power tool motors, micro-specialty motors, household appliance coils, and military-grade electronic components.

2. Working Principle

The VPI equipment achieves deep penetration of insulating materials/functional media through synergistic vacuum and pressure control. The core process comprises 5 steps:

Pre-treatment: Components (e.g., motor windings, transformer coils) undergo cleaning and pre-baking to remove surface contaminants, internal moisture, and volatile impurities, preventing pore blockage.

Vacuum Deaeration: Components are placed in a sealed impregnation tank and evacuated to high vacuum (typically 1–10 mbar; advanced models ≤50 Pa), eliminating air/residual gases from internal pores and layers to remove gas resistance for penetration.

Negative-Pressure Impregnation: Insulating varnish/impregnation medium is injected under vacuum, leveraging negative pressure to draw the medium into internal micro-gaps.

Pressure Enhancement (Advanced VPI Models): After medium injection, compressed air/nitrogen is applied at 0.3–0.8 MPa (supporting stepwise pressurization), forcing the medium into micron-level pores to maximize fill rate.

Post-Processing: Excess medium is drained off, followed by curing in a temperature-controlled oven (±1°C to ±1.5°C accuracy), forming a uniform, dense insulation layer.

3. Key Features

Compliant with the latest national standards for motor and transformer manufacturing. Features a rational control system, simple operation, high reliability, and stable long-term performance with excellent energy efficiency.

Superior to conventional impregnation: Achieves deeper, uniform penetration without air pockets. As a critical production process, VPI directly enhances product quality and manufacturing efficiency.

All-in-one sealed tank process: Bare components loading → vacuum impregnation → pressurization → pressure holding → depressurization → medium recovery → drain-off → cleaning. Parameters are fully customizable to meet specific product requirements. Ensures zero material waste, reducing costs.

4. Technical Specifications

Note: Equipment design can be customized based on client specifications.