Application of Miniature Vacuum Pumps in Closed-loop Gas Systems
1.Background Introduction
In the electronics manufacturing industry, it is often necessary to test whether the gases produced by chemical substances attached to products under high-temperature and pressurized conditions are toxic or polluting, potentially harming human health. Products need to be placed in sealed high-temperature chambers (generally below 100°C) for heating experiments. The gases generated in these chambers are then extracted for testing before being pumped back into the original chamber to continue the reaction. In such closed-loop gas systems, miniature vacuum pumps are required to serve as the power source for gas flow. Applications include production testing of multilayer flexible boards, flexible circuit board substrates, protective films, and related fields.
2.Application Overview for Miniature Vacuum Pumps
When using closed-loop gas systems to detect gas content, miniature vacuum pumps are typically employed to drive gas flow through the pipelines. Due to their compact size, low power consumption, and ease of control and connection, micro pumps have gained significant favor among laboratory personnel. They are particularly effective in precisely regulating small flow rates and low pressures. However, most micro pumps currently available on the market have limited functionality, short lifespans, and can only handle gas at room temperature, falling far short of meeting user requirements.
Chengdu Hilin Technology has developed miniature vacuum pumps that offer multiple speed control methods, allowing users to select the most suitable option for their specific applications. For customers requiring handling of high-temperature gases (50-100°C), we specially offer customizable high-temperature micro vacuum pump solutions to meet various on-site needs.
Additionally, in some closed-loop gas systems, the sealed high-temperature reaction vessel (Container A) operates under positive pressure. When a micro pump extracts gas from Container A to another container (Container B) for testing, the internal pressure of Container A decreases. Due to gas line resistance, both the pressure and flow rate of gas returning from Container B to Container A experience attenuation, affecting the pressure conditions required for product reactions in Container A.
To maintain constant pressure in Container A, an identical micro vacuum pump can be installed at the gas inlet of Container A. By supplying the same electrical control signal to both pumps, when gas is extracted from Container A’s outlet causing pressure reduction, the inlet pump can replenish an equivalent gas flow.
3.Project Challenges
1)The application requires extraction of high-temperature gases (70-90°C), which most standard miniature vacuum pumps cannot handle.
2)Users need to test multiple data sets and frequently adjust pump flow rates, requiring simple operation and clear visualization of pump status.
3)During gas extraction and testing in closed-loop systems, the positive pressure in the reaction vessel must remain constant without being compromised by gas extraction. The extracted and injected gas flow rates need to be closely matched.
4.Solutions
1)Hilin Technology’s miniature vacuum pumps are suitable for handling high-temperature gases (50-100°C) and can be customized for high-temperature applications.
2)For user convenience, we have developed touchscreen-enabled vacuum pumps that allow direct speed adjustment via “+/-” buttons on the display. The screen clearly shows real-time operating status, and any pump stoppage or abnormality triggers visible alarm codes for quick troubleshooting. The pump can be started/stopped directly via the touchscreen.
3)Any two identical models of Hilin’s miniature vacuum pumps demonstrate excellent parameter consistency. In complex closed-loop systems with significant gas line resistance, using two identical D-series pumps with identical control signals ensures nearly equivalent flow rates and output pressures, maintaining stable vessel pressure (Note: This requires identical gas line specifications between pumps and similar resistance. The vessel’s positive pressure must not exceed the pump’s maximum output pressure).
For inquiries about micro pumps, please contact us via email at [email protected].