Methods for checking the airtightness of a device: hot compress method, water injection method, pumping method.
1, hot compress method
The lower end of the catheter is immersed in water, hold the tube tightly in your hand, if there are bubbles coming out of the mouth of the catheter, release your hand, the water enters into the catheter to form a section of the column of water, proving that the device is airtight.
2, water injection method
To the long-necked funnel to add water to the water immersed in the lower end of the long-necked funnel, the formation of a liquid seal, close the stop clamp, continue to the long-necked funnel water, if the formation of a section of the column of water, and for a period of time does not fall, proving that the device is well airtight.
3, pumping method
To the long-necked funnel with water to the water immersed in the lower end of the long-necked funnel, the formation of a liquid seal, slowly pull the syringe piston outward, if you see bubbles coming out of the conical flask, proving that the device is well airtight.
Device airtightness principle
The principle of airtightness test is, first let the device and additional liquid, constitute a closed whole, change the temperature of this whole, resulting in a change in pressure to determine the airtightness of the good or bad, due to the different devices, the test method is also different. Compressed air (or ammonia, freon, helium, halogen gas, etc.) is pressed into the container, and the pressure difference between the gas inside and outside the container is utilized to check for leaks in the test method.
Gas tightness inspection requires the use of gas tightness tester, which is specially applied to the cavity mechanical products for sealing detection device. Mainly used in automotive engines, gearboxes, axles, water tanks, fuel tanks and other sealing requirements for the cavity of the production. Airtightness tester adopts the intelligent design of embedded control, which can automatically complete the test program and automatically discriminate the inspection results.