Five minutes to understand the working principle and key points of air tightness detector

First of all, Mr. Deng focused on the basic principles of the air tightness tester and its specific working methods. The air tightness test instruments we use are mainly divided into three types from the principle level, namely direct pressure method, differential pressure method and flow method, and each principle has its unique detection logic and advantages.

As for the direct pressure method, it is further divided into two different situations: positive pressure and negative pressure. The operation of positive pressure is like "blowing" to the test object, injecting a certain pressure of gas into it, and then observing the corresponding pressure changes to judge whether its air tightness is good; while negative pressure is similar to the "inhalation" operation, extracting gas from the inside of the test object, and also determining whether there is a leak or other air tightness problem based on the change in pressure. This direct pressure method, which changes the air pressure and observes the change in pressure value, is widely used in the air tightness detection of many conventional products. Its operation is relatively intuitive and the results are relatively easy to judge.

Then, Mr. Deng mentioned the differential pressure method. The detection principle of the differential pressure method is figuratively speaking, just like using a balance scale. In the actual operation process, a sample that has been determined to be a qualified product will be selected and tested at the same time as the test product to be tested. The two will be placed under the same testing conditions to compare the pressure difference they present during the test. If the pressure difference between the test product and the qualified product is within a reasonable range, it means that the air tightness of the test product is qualified; on the contrary, if there is an obvious deviation that exceeds the established qualified standard, the test product will be judged as an unqualified product. The differential pressure method, with its high-precision comparison detection characteristics, plays an extremely important role in production scenarios where air tightness requirements are high and product consistency needs to be precisely controlled.

Let's talk about the flow method, which is mainly used in the detection of valves and pipelines. As we all know, the air tightness of products such as valves and pipes is largely reflected in whether the flow rate of the internal fluid meets the standard requirements. The flow method grasps this key feature. Through professional equipment and technical means, the flow value of the fluid in the pipeline is accurately tested, and then the air tightness of the product is judged according to the corresponding industry standards and the qualified parameter range pre-set by the product to determine whether the air tightness of the product meets the qualified standard. This method plays an indispensable role in ensuring the sealing and safety of valves and pipes in actual use.

Finally, Mr. Deng also listed the application of our air tightness testing instruments in various industries in a very comprehensive manner. Different industries have different requirements for product air tightness. For example, in the automobile manufacturing industry, the air tightness of key components such as engines and brake systems is related to the performance and safety of the entire vehicle; in the electronic equipment industry, the shell sealing performance of products such as mobile phones and tablets affects their waterproofness, dustproofness and the stable operation of internal components. Based on the characteristics of different industries, Mr. Deng introduced in detail how our testing instruments can adapt to them and play a role.

At the same time, Mr. Deng also explained in depth the test standard parameters of the airtightness testing instrument. These standard parameters cover many key indicators such as pressure range, flow range, allowable error value, etc. Each parameter is verified by a large number of experiments and summarized by industry practices. Only by strictly following these standard parameters for testing can we ensure the accuracy and reliability of the test results and ensure the quality of the product.

In addition, Mr. Deng did not forget to mention some common problems when the product uses the airtightness testing instrument, such as the impact of the temperature and humidity of the testing environment on the results, the accuracy calibration of the instrument after long-term use, and the possible misjudgment of different types of products during testing, etc., and gave corresponding solutions and preventive measures for these common problems, helping us to use these testing instruments more smoothly and efficiently in the actual operation process, and ensuring the smooth progress of the testing work and the effectiveness of the test results.

Through Mr. Deng’s detailed introduction, we not only have a clear understanding of the principle and working method of the air tightness tester, but also have a comprehensive understanding of its industry application, testing standards and issues that need to be paid attention to during use, which has laid a solid foundation for us to better use this equipment in related work in the future.