October 10, 2025
Vacuum cleaning drying machine uses the physical changes of liquid in vacuum state to change some characteristics of hydrocarbon cleaning agent and cleaned object, so as to maximize the advantages of hydrocarbon cleaning agent. The main functions of vacuum technology in cleaning are:
1. Remove air from the cleaning agent to reduce ultrasonic attenuation.
In order to improve the cleaning effect, ultrasonic technology is generally used in the cleaning machine. The ultrasonic vibrator vibrates tens of thousands of times per second and emits sound waves more than 100,000 times.
2. Remove air from the surface and slots of the workpiece to improve cleaning effect.
In conventional cleaning processes, suboptimal results often occur due to trapped air in blind holes, rough surfaces, and fine crevices that hinder cleaning agent penetration, creating cleaning blind spots. The application of vacuum technology enables complete removal of air from part surfaces, gaps, and blind holes, allowing the cleaning agent to fully penetrate every component. This ensures optimal cleaning across all workpiece surfaces. For components with complex geometries or deep blind holes, multiple vacuum extraction and exhaust cycles can achieve complete air removal. Consequently, vacuum-assisted cleaning delivers superior results compared to atmospheric pressure methods.
3. Boiling point, hydrocarbon cleaning agent can also achieve gas phase cleaning.
Ultrasonic cleaning machines using halogenated hydrocarbon cleaning agents leverage their low-boiling-point characteristic. During the final cleaning stage, the agent is heated to produce pure vapor, which then purges contaminants from the workpiece through vapor-phase cleaning. This process ensures oil residues dissolved in the solution are completely removed. However, since hydrocarbon-based cleaning agents have higher boiling points than flash points, conventional atmospheric pressure cannot achieve effective vapor cleaning of workpieces.
4. Use the vacuum flash effect to improve the drying speed.
Since the boiling points of hydrocarbon cleaning agents are all above 140℃, it generally takes about an hour to completely evaporate under normal temperature and pressure. Such a drying speed certainly cannot meet the time requirements for process cleaning. However, the heating drying method is prone to fire hazards, which is one of the main reasons why hydrocarbon cleaning agents have not been widely used in China. The vacuum cleaning dryer typically combines steam cleaning with vacuum drying in a single chamber. While steam cleaning the workpiece and raising its temperature, the drying chamber rapidly enters a higher vacuum state. The cleaning solution on the workpiece surface will suddenly boil (vacuum flash effect) and evaporate completely. This reduces the drying time of the workpiece to within minutes.
5. Vacuum distillation is used to regenerate and reuse the hydrocarbon cleaning agent.
The distillation regeneration process for cleaning agents works by leveraging the boiling point difference between the agent and contaminants. The contaminated agent is heated above its boiling point while being cooled below that of the oil, causing vaporization. This vapor is then condensed back into pure cleaning agent through a condenser, while heavier contaminants like oil and mechanical impurities remain settled at the bottom of the distillation tank.
6. Isolate oxygen, so that the hydrocarbon cleaning agent loses the condition for combustion.
In a vacuum state, the oxygen content is very low. In the process of cleaning, drying and distillation regeneration, even if the temperature of the hydrocarbon cleaning agent reaches above the flash point, the hydrocarbon cleaning agent will not burn because there is no oxygen, which is a necessary condition for combustion, thus ensuring the safety of use.
