Scroll vacuum pumps for leak detection: efficient, clean and precise solutions

In the fields of industrial production and scientific research, vacuum leak detection technology is the core link to ensure the sealing of equipment and improve product quality. As the core equipment of the leak detection system, the performance of the vacuum pump directly affects the efficiency and accuracy of leak detection. In recent years, the scroll vacuum pump has gradually become the preferred equipment in the field of leak detection due to its advantages such as oil-free operation, low noise and high reliability. This article will analyze how the scroll vacuum pump provides efficient support for leak detection technology based on the principles, advantages and actual application scenarios.

1. Working principal of vacuum leak detection 
   The working principle of vacuum leak detection is based on creating a vacuum within a system or component and then monitoring the system to detect any changes that indicate a leak. Here's a step-by-step explanation:
   a. Evacuation
   The system or component is evacuated to create a vacuum, meaning the pressure inside is significantly reduced below atmospheric pressure.
   b. Stabilization
   The system is allowed to stabilize at this vacuum level for a period. This ensures any initial pressure drop due to adsorption or desorption processes has settled.
   c. Pressure Monitoring
   A sensitive pressure gauge or vacuum meter monitors the vacuum level. If the system is sealed correctly, the vacuum level should remain stable.
   d. Leak Detection
   Direct Leak Detection:
   If the vacuum level starts to rise (pressure increases), it indicates that air or another gas is entering the system, which means there's a leak.
   Locating Leaks:
   Helium Leak Detection: Helium, due to its small molecular size, is often used as a tracer gas. The system is enveloped with helium, or helium is sprayed around potential leak areas. A mass spectrometer or helium leak detector connected to the system can detect helium entering through leaks.
   Vacuum Probes: Sensitive vacuum probes can also be used around the exterior of the system. These probes are designed to detect the minute flow of gas escaping from a leak.
   e. Analysis
   The rate at which the pressure increases or the amount of tracer gas detected can be used to quantify the leak rate, often measured in units like Pascal-liters per second (Pa·L/s) or mbar·L/s.
   
   
2. Working principal of scroll vacuum pump 
   
   The scroll vacuum pump is designed based on the principle of 'scroll motion', and its core consists of a pair of involute scroll(fixed scroll and orbiting scroll disk). For more about scroll vacuum pump working principal 
   
   
3. The core advantages of scroll vacuum pumps in leak detection
   
   a. High cleanliness, avoid pollution
   Oil-free operation: Traditional oil-sealed pumps may contaminate the inspected parts (such as semiconductor chips and optical components) due to residual oil vapor, while the vortex pump runs completely dry, meeting ISO Class 1 cleanliness requirements.
   
   Reduce misjudgment: Oil vapor may interfere with the mass spectrometer signal (such as helium mass spectrometer leak detection), and the vortex pump can ensure the accuracy of the test results.
   
   b. Fast pumping and stable vacuum
   Efficient pumping speed: The scroll pump has a stable pumping speed in the low vacuum range (1000~1 Pa), and can quickly establish the basic vacuum environment required for leak detection.
   
   
   c. Low maintenance and long life
   Simple structure: There are only two core moving parts, the orbiting scroll and the fixed scroll, with extremely low failure rate.
   
   Maintenance-free design: No need to replace lubricating oil, maintenance costs are reduced by more than 50%.
   
   
4. Typical application scenarios and cases
   
   a. Semiconductor manufacturing: chip packaging leak detection
   Background: Chip packaging needs to ensure absolute sealing inside to prevent moisture or impurities from invading.
   Application:
   The scroll pump is used in conjunction with a helium mass spectrometer leak detector to quickly extract the gas in the packaging cavity to 10⁻² Pa.
   The helium tracer method is used to detect micron-level leaks, and the leak rate detection accuracy can reach 10⁻¹² Pa·m³/s.
   Case effect: After a wafer factory uses a vortex pump, the leak detection cycle is shortened by 30%, and the false alarm rate is reduced to less than 0.1%.
   
   b. Medical equipment: vacuum sealing packaging detection
   Background: Medical syringes, blood bags, etc. require 100% sealing detection.
   Application:
   Integrated scroll pump online leak detection system, combined with pressure decay method for batch detection.
   Complete single-piece vacuuming and pressure monitoring within 10 seconds, and the detection volume per hour reaches more than 500 pieces.
   
   c. New energy industry: lithium battery shell leak detection
   Background: If there is a slight leak in the lithium battery shell, it may cause electrolyte leakage or explosion risk.
   Application:
   Automated leak detection line using vortex pump + differential pressure sensor.
   Detection pressure range 0.1~100 Pa, leak rate resolution up to 0.01 cm³/min.
   
   
5. Selection and suggestions of scroll vacuum pump
   
   a. Key parameters for selection:
   Ultimate vacuum: Select according to the leak detection requirements (conventional leak detection requires ≤10⁻² Pa).
   Pumping rate: Match the chamber volume and leak detection cycle requirements.
   Corrosion resistance: If the detected gas contains corrosive media (such as acidic gas), a special coated vortex disk must be selected.
   
   b. Maintenance precautions:
   Clean the air inlet filter regularly to prevent particles from entering the pump body.
   Avoid long-term operation under extreme vacuum to extend the life of the vortex disk.
   
   
6. Trends: intelligence and integration
   Intelligent monitoring: Real-time monitoring of pump temperature, vibration and other parameters through the Internet of Things (IoT) to warn of potential failures.
   
   Modular design: Integrated with leak detectors and sensors to create a 'one-stop' leak detection workstation.
   
   Green energy saving: Optimized motor drive technology, energy consumption is reduced by 20%~30% compared with traditional pumps.
   
   The scroll vacuum pump is redefining the possibilities of leak detection technology with its clean, efficient and stable characteristics. As the manufacturing industry's requirements for precision and reliability become increasingly stringent, the application of scroll pumps in high-end fields such as semiconductors, new energy, and medical treatment will continue to deepen. For enterprises, choosing an appropriate scroll vacuum pump is not only a technological upgrade, but also a strategic investment to improve product quality and production efficiency.