The methods of waterproof testing equipment mainly adopt two categories: bubble method and pressure method. Dedicated airtightness testing equipment is widely used in diving equipment, car lenses, cameras, DV lenses, surveillance lenses, mobile phones, watches, automobiles, aviation, electronics, electrical appliances, refrigeration equipment, household appliances, gas equipment appliances, new energy, etc. Industry's engine cylinder heads, water and oil ducts, spin-on filters, water pump and oil pump assembly shells, automotive radiators, shock absorber seals, intake and exhaust manifold silencers, various valves and various products are waterproof and airtight Sexual testing.
The working principle of waterproof testing equipment can be divided into two categories: direct pressure type and differential pressure type according to different detection methods. Among them, the differential pressure type is divided into two kinds of positive and negative pressure. The negative pressure tightness tester mainly adopts the vacuum test method, and the positive pressure tightness tester adopts the positive pressure method inflating principle.
The operation process of the direct pressure type of the waterproof testing equipment: inflate the chamber of the tested workpiece under a certain pressure condition, then cut off the connection between the tested workpiece and the air source and record the pressure indication value at this time after a certain period of time. After time, take the current pressure indication again and compare it with the last recorded pressure indication. If there is a difference between the two pressure indications, it means there is leakage in the measuring chamber. The size of this difference reflects the leakage state of the tested workpiece during the detection time period. The larger the difference, the more serious the leakage of the workpiece. If the difference is within the allowable range, the tested workpiece can be considered qualified. Otherwise, it is deemed unqualified.
Differential pressure detection is like weighing with a lever balance. Put a reference weight on one end of the balance, and put the parts to be inspected on the other end. The number of parts is continuously increased and reduced to make the balance reach balance. At this time, the quality of the weight is the quality of the part. Waterproof testing equipment differential pressure detection operation process: Under the same process and state conditions, use""standard product" as a reference, and then compare the tested workpiece with the "standard product", relying on the difference To judge whether the tested workpiece is qualified. First connect the standard product to the standard product marked by the air-tight instrument, and then inflate the standard product and the chamber of the tested workpiece at the same time. After a period of equilibration, the standard product and the chamber Completely cut off the pressure monitoring for several seconds or tens of seconds and compare the pressure indication difference between the two, then the pressure indication difference is the pressure leakage value of the measured workpiece cavity. If the pressure indication difference is within the allowable range It is deemed that the tested product is qualified, otherwise it is unqualified.
