Micro-vacuum pump crop body adsorption type selection should pay attention to the problem

Scientific research, medical, laboratory, instrumentation and other industries often use micro-pumps for object adsorption, but micro-pumps include micro-vacuum pumps, gas sampling pumps, micro-gas circulation pumps, micro-pumping and air-pumping pumps, etc. How to choose?
When the micro vacuum pump is used for object adsorption, it is actually pumping the suction cup and sucking the object. Therefore, it is necessary to select a micro vacuum pump in the true sense, such as VAA, PK, PC, VCA, VCH, PH, etc. See http:// for details, but not for gas sampling pumps.
How to calculate the suction force of the micro vacuum pump and the calculation formula can be found in:
Http://zhidao.baidu.com/question/34492043.html
1. In addition to considering the degree of vacuum, consider the area of ​​the suction cup connected to the pump, because the air tube at the pumping end of the pump is easy to leak, so the suction of the general object should use the suction cup to maintain the vacuum.
2. It depends on which way the object is adsorbed.
(1) Vertical adsorption
This is the easiest way if the pump is holding the object up.
The main reason is that the pumping force provided by the pump against the gravity of the object requires knowing the weight of your object and the area of ​​the suction cup to be used (refers to the effective contact area with the object being sucked).
Suction force = suction pressure * contact area is obtained
(Unit: kilogram force, and the suction pressure is 0.01* (100-vacuum pump vacuum (absolute pressure)), the unit is kilogram force / square centimeter, contact area unit: square centimeter)
Selection principle:
In this case, the suction cup of the same area,
1 If the adsorbed object is light, you can use PK5008 (http://): F=0.01*(100-50)*1=0.5Kgf/cm2 ie 0.5 can be lifted per square centimeter kg;
2 If it is medium weight, please choose PH2506B, PC3025N (http://):
F1=0.01*(100-25)*1=0.75Kgf/cm2 (0.75 kg can be lifted per square centimeter)
F2=0.01*(100-30)*1=0.70Kgf/cm2 (0.7 kg can be lifted per square centimeter)
3 If it is heavy, you can choose VCH1028 (http://):
F=0.01*(100-10)*1=0.9Kgf/cm2, that is, 0.9 kg can be lifted per square centimeter;
Of course, for the same pump, the method of increasing the number of suction cups can also be used to increase the overall suction force, but the corresponding time to reach the desired suction force is also increased (because the number of suction cups increases, the volume to be pumped also increases). ).
(2) Other methods (such as adsorption and fixation at the bottom of the object, side plane adsorption, etc.)
The situation is more complicated, because the suction force provided by the pump is against a variety of forces, such as friction (related to the coefficient of friction of the plane), etc., it is necessary to put the pump into the system, combined with the specific circumstances tested. Of course, the selection of the pump can still refer to the above principle: only the remaining margin, need to be larger.

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