Waterproof speakers are often used in large-scale outdoor performances, open-air stadiums, parks, school playgrounds, etc. These speakers are waterproof and can withstand the severe test of outdoor wind and rain.The speaker is the most important sound-producing component in waterproof speakers. Water has a particularly great impact on the speaker. Once water enters, the speaker speaker is likely to lose its function.If done to the speakerAir tightness testing, such as the speaker madeIP67 waterproof level testing can protect the speakers from rain.

(Speaker air tightness testing equipment)

Nowadays, manufacturers generally choose waterproof and breathable membranes to waterproof speakers.Speakers that have been waterproofed need to be tested to see if their waterproof performance meets the standard.The waterproof testing method for speakers is generally to use an air tightness detector and use compressed air as the testing medium to test the sealing performance of the product.

The principle of air tightness test isThe pressure decay method means to pressurize a product and observe the pressure change of the gas.There are two situations here. One is that the product itself has an inflation hole. We will directly inflate and pressurize the product, then cut off the air source and observe the changes in gas pressure. If the pressure drops, it means that the product is leaking. If it does not drop, it is good.The second type is that the product does not have an inflatable hole. We need to make a sealed cavity with the same size as the product shape and specifications, that is, a grinding tool, try to fit the product as much as possible, because the detection results will be more accurate, and then pressurize the gas.

The gas willCharge toproducts andMoldThen cut off the gas source and check whether the gas pressure drops. If there is a leak, the gas will leak into the product. If there is no drop, it is good.

(Speaker air tightness testing equipment)

The detection principle is very simple, but as air is a very small molecule, whether it can detect its changes and the size of the changes depends on our sensors and the precision of the sensors.The more accurate the sensor is, the more sensitive and stable the air tightness detection will be.Hirays air tightness detector uses Honeywell sensors and American Fairchild precision pressure regulating valves, combined with patented"Intelligent pressure difference algorithm", the minimum resolution is better than 1 Pa, this algorithm has obtained a national patent.

The product that needs to be tested this time is an outdoor audio speaker. From the appearance of the product, it can be seen that the product is a complete finished product without an inflation port. According to the appearance of the product, a mold is made for the product, and the waterproof performance of the speaker is tested by inflating the mold.This method of air tightness testing through the mold is called indirect testing.

According to customer requirements, the waterproof level of the speaker isIP67, considering the endurance of the speaker membrane, we use the negative pressure suction method for testing.Hai RuisiAir tightness detectorIt comes with two pressure test methods. The positive pressure test is to test by directly inflating the inside of the product or the inside of the mold.Negative pressure test: Test by vacuuming from inside the product or from the inside of the mold where the product is tested.Corresponding to the IP67 waterproof detection pressure, the test pressure is -10.5kpa, and the maximum allowable leakage is 0.1kpa. The air intake time is 5s, the pressure stabilization time is 5s, and the test time is 5s.

Connect the air tightness detector and testing tooling to the power supply and air source.After setting the test program, you can start the air tightness test.

Hirays Technology has made many air-tightness testing equipment for speakers, including large ones for car speakers and audio speakers, and small ones for mobile phone speakers and earphone speakers.We have mature and professional air tightness testing solutions for waterproof testing of various speakers.If you are interested in speaker waterproof testing, please call Hirays Technology.