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Briefly describe the vacuum sealing unit

source：www.ppplus.cn | Release time：2025年06月17日

A vacuum sealing unit is a device used for sealing electronic components, sensors, wire harness connectors, and other parts. By eliminating air and bubbles through a vacuum environment, the sealing material (such as silicone, epoxy resin, etc.) is filled more evenly and tightly to the part to be sealed, improving the waterproof, insulation, seismic and other performance of the product. The following is a brief description from the aspects of function, composition, working principle, and application scenarios:
1、 Core functions
Vacuum defoaming: By vacuuming and removing bubbles from the sealing material, voids can be avoided after solidification, which can affect the sealing effect;
Sealing: Inject materials into the components to be sealed in a vacuum environment, ensuring that small gaps, holes, and other details are completely filled to improve sealing reliability;
Environmental adaptation: Suitable for precision components with high requirements for sealing and insulation, to prevent water vapor, dust, and corrosive substances from entering.
2、 Main components
1. Vacuum system
Vacuum pump: provides a vacuum environment (usually with a vacuum degree of -90kPa to -100kPa), used to extract air and bubbles from the material inside the sealing chamber;
Vacuum chamber: accommodates the components to be sealed and the sealing material, with a sealed structure to ensure a stable vacuum environment.
2. Sealing material supply system
Storage tank: stores sealing glue, resin and other materials, and some systems have heating functions (such as temperature control devices) to prevent material solidification or viscosity increase;
Metering pump/valve: Correctly control the material output and support the ratio sealing of single component or two-component materials (such as A/B glue mixture).
3. Motion and Control System
Mechanical arm/mobile platform: locate the components to be sealed and achieve automated sealing (such as fixed-point injection and trajectory spraying);
Control panel: Set parameters such as vacuum degree, sealing amount, curing time, etc., support program preset and automated operation.
4. Auxiliary components
Curing device: Some units integrate heating or UV curing functions to accelerate material curing;
Waste gas treatment: Filter volatile gases that may be generated during the sealing process to ensure operational safety.
3、 Working principle
Preprocessing: Place the components to be sealed into a vacuum chamber and check if the viscosity and ratio of the sealing material meet the requirements;
Vacuuming: Start the vacuum pump to achieve the preset vacuum degree (such as -95kPa) in the chamber, and maintain it for a period of time to eliminate air in the gaps between components and materials;
Sealing operation: In a vacuum state, material is injected into the area of the component to be sealed through a metering pump, and the material is penetrated into fine gaps using vacuum negative pressure;
Pressure relief and curing: Slowly release the vacuum to allow the material to naturally level under normal pressure, and then form a sealing layer by heating or curing at room temperature.
4、 Typical application scenarios
Electronic industry: Encapsulate power modules, sensor chips, PCB circuit boards to prevent moisture or short circuits;
Automotive manufacturing: waterproof sealing of wire harness connectors, motor coils, and onboard controllers to adapt to high temperature and vibration environments;
Aerospace: Vacuum sealing of precision instruments and connectors to meet high reliability and extreme environmental requirements;
In the field of new energy, the sealing of lithium battery cells and photovoltaic junction boxes improves waterproof and insulation performance.
5、 Advantages and Characteristics
High sealing performance: no bubbles in vacuum environment, dense sealing layer, waterproof level up to IP67 or above;
Controllable process: high degree of automation, adjustable parameters such as sealing volume and vacuum degree, suitable for mass production;
Strong material compatibility: supports various sealing materials such as silicone, epoxy resin, polyurethane, etc., to meet different performance requirements;
Improve product life: reduce the erosion of environmental factors on components, and extend the service life of equipment (such as outdoor equipment aging resistance).

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