Miniature vacuum pump adsorption selection should pay attention to the problem

Micro-air pump is often used in industries such as scientific research, medical treatment, laboratory, instrumentation and so on to adsorb objects. However, miniature air pumps have many forms, such as miniature vacuum pump, gas sampling pump, micro gas circulation pump and mini suction pump. How to choose it? The miniature vacuum pump for object adsorption, the pump is actually used to suck the suction cup sucked objects, therefore, must choose the true sense of the miniature vacuum pump, such as VAA, PK, PC, VCA, VCH, PH and other products, And can not choose gas sampling pump. How to calculate the suction force of the miniature vacuum pump and the calculation formula can be found in: 1. In addition to considering the degree of vacuum, but also consider the area of ​​the suction cup connected to the pump, because the suction end of the trachea is easy to leak, so the general object adsorption should be used Suction cup to keep the vacuum. 2. To see what kind of object adsorption (1) vertical adsorption If the pump is in the upper adsorption of objects, this is the easiest way. It is mainly the pumping force provided by the pump to counteract the gravitational force of the object and you need to know the weight of your object and the area of ​​the sucker to be used (refer to the effective contact area of ​​the object being sucked). Suction force = suction pressure * Contact area Unit: kilogram force, and the suction pressure is 0.01 * (100 - vacuum degree of vacuum pump (absolute pressure)) obtained in kilograms force / square centimeter, the contact area unit: square centimeter) Selection principle: In this case, The same area of ​​the suction cup, ① fruit adsorption body lighter, you can use PK5008 that can lift 0.5 kg per square centimeter; ② If it is medium weight, optional PH2506B, PC3025N F1 = 0.01 * (100-25) * 1 = 0.75Kgf / cm2 (up to 0.75 kg / cm²) F2 = 0.01 * (100-30) * 1 = 0.70 kgf / cm2 (0.7 kg / cm² respectively) ③ VCH1028 F = 0.01 * (100-10) * 1 = 0.9Kgf / cm2 that can lift 0.9 kg per square centimeter; of course, the same pump, you can also take to increase the number of suction cups to improve the suction, but the corresponding to achieve the desired pumping Suction time also increased (Because of the increased number of suction cups, to smoke also increases the volume). (2) Other methods (such as fixed adsorption at the bottom of the object, side-plane adsorption, etc.) are more complicated because the pumping force provided by the pump is resistant to a variety of forces, such as frictional force (related to the coefficient of friction on the plane) Etc., you need to pump into the system, combined with the specific circumstances of the test. Of course, the selection of the pump can still refer to the above principle: only the margin left, need more.

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