In some aquariums selling ornamental fish and geomantic fish, you can see the aquarium oxygen pump. It increases the oxygen in the water for the fish in the fish tank. Oxygen-making equipment in the market is usually divided into large and small ones. Small aquariums need oxygen pumps, and large ones are air-compressed aerators, which are often used in large aquariums, large aquariums, fish ponds and other places with high demand for koi fish.
Selection method:
1, visual inspection, after getting the air pump, the first thing to look at is whether the outer packaging is complete, or whether there are signs of extrusion and obvious collision. If not, proceed to the next step, because the rough handling in the transportation process is likely to cause some parts, screws, leather cups, electromagnetic springs and other parts inside the air pump to loosen, which is also one of the factors that produce * * * vibration, which is difficult to solve.
After the air pump is electrified, it will produce a lot of noise due to the comprehensive factors such as no air pipe, no load inside and airflow at the air outlet. This is true regardless of grade. At this time, you can hold down the air outlet with your fingers, temporarily stop the venting sound, listen carefully to the vibration sound, and choose according to the size of the vibration sound.
2, contact test, the so-called contact test, is to let the air pump's own feet contact with fixed hard objects such as glass and desktop. After electrifying, repeat the second step and observe whether the noise under contact is within the acceptable range.