Current status of air tightness detection technology and development direction of air tightness leak detection - Automation technology

Air tightness testingIt is an important process to ensure product quality and production safety. Its role in the production process has been widely recognized, and its application fields have become wider and wider. It has expanded from the previous automobile manufacturing industry to the current general electronic components, household appliances, security products, medical equipment, etc.

Air tightness detectorThe main function is to determine the product sealing, waterproof performance, and leakage.

Commonly used methods for air tightness testing include bubble method, smear method,Air tightness testing method, pressure drop method, flow method, ultrasonic method, etc.Traditional leak detection methods mostly use bubble method and smear method.The bubble method is to immerse the workpiece in water, fill it with compressed air, and then collect the leaked bubbles within a certain period of time to measure the leakage amount.The smearing method is to apply a bubble-prone liquid such as soapy water on the surface of a workpiece that is filled with a certain internal air pressure, and observe the bubbles to detect the size of the leakage.These two methods are simple to operate and can directly observe the leakage location and leakage situation. However, because the location and number of leaks in the workpiece are not known in advance, it is difficult to collect all bubbles, which affects the accuracy of the measurement. Secondly, for parts that are large, bulky, and have complex outer surfaces, bubbles adhere to the bottom and folds of the part and are difficult to observe. After the test, the workpiece needs to be cleaned and dried, making it impossible to achieve automatic and quantitative leak detection.Therefore, these two methods are insufficient to meet the high-precision and high-efficiency production requirements.

Current status of air tightness testing technology at home and abroad

In order to improve detection accuracy and efficiency and realize detection automation, the currently popular air tightness detection method is the differential pressure method. If the container being tested leaks, it will inevitably cause the loss of gas quality and a drop in pressure in the container, which will reduce the original air pressure in the container. By measuring the gas pressure drop in the container, the actual amount of gas leaking from the container can be deduced to achieve the purpose of air tightness testing.

Air tightness testerThe relationship between leakage flow and differential pressure can be expressed by the following formula:

PT is the test pressure, P0 is the external pressure (atmospheric pressure), VW is the volume of the container under test, VS is the reference container volume, V is the change in the internal volume of the differential pressure sensor caused by the generation of differential pressure,ΔVL is the amount of leakage discharged into the atmosphere,ΔP is the differential pressure, QL is the gas leakage flow rate, and t is the test time corresponding to the generation of differential pressure △P.Among them, PT P0 are absolute pressures.

Based on the above basic principles, many domestic and foreign manufacturers have developedAir tightness detector, the more famous domestic company is Hiraysi Automation Technology Co., Ltd.Hiraysi is the world's pioneer in manufacturing air tightness testing instruments, covering automotive, home appliances, die-casting, packaging, valves, electronics, aviation and other fields.Hirays Company also produces many types of air tightness testers, providing a variety of detection modes. It also takes into account leak detection performance, leakage volume, and provides corresponding products according to the volume and leakage volume of different objects to be measured in practical applications.

Due to the current increase in waterproofing demand and the development of mechanical automation, air tightness testers must also develop in the direction of automation if they want to achieve better development.

The automated air tightness tester provides speed guarantee, frees up human resources, and guarantees speed and cost for the enterprise's waterproof and air tightness testing.

Nowadays, Hiraysi's air tightness detector has implemented automatic technology and can be used for automated testing of production lines, and has become a popular choice among customers.Became the benchmark for air tightness detectors

The parameters of Hiraysi air tightness detector are as follows:

Air supply pressure: 0.4~1.2MPa

Power supply voltage: 220v/50hz or 110v/60hz

Pressure adjustment range: -40~-0.5KPa, 5~150KPa

Pressure adjustment accuracy: 0.1KPa

Pressure test range: -80~150KPa

Pressure decay test minimum resolution 1Pa

Minimum resolution of leakage flow test: 0.01ml/min