Comparison of vacuum generator and micro vacuum pump

"Micro vacuum pump" and "vacuum generator" are two devices that are the same. The main difference is that the micro vacuum pump is powered, and the vacuum generator uses compressed air to create a vacuum.
Where compressed air is present, it is a good idea to use a vacuum generator to obtain a vacuum. In places where there is no compressed air, it is more convenient to use a micro vacuum pump to obtain a vacuum. No one will specifically use an air compressor to obtain this vacuum. A solution with a vacuum generator.
Micro vacuum pump, micro air pump, miniature negative pressure pump, with oil-free, maintenance-free features, can be widely used in industrial automation equipment such as robots, chip adsorption devices, printing machinery.
The micro vacuum pump is used with the vacuum suction cup to adsorb the item. The following models are used most:
Model
Adsorption force per square centimeter of area (theoretical value)
Flow rate (L/min)
PK5008
0.5 (Kg)
8
PC4020N
0.6 (Kg)
20
PC3025N
0.7 (Kg)
25
VCA5038B
0.5 (Kg)
38
VCH1028
0.9 (Kg)
28
The "adsorption" data in the above table is the value of the adsorption force generated per square centimeter of the suction cup after the pump is evacuated, in the absence of gas leakage (almost impossible). Under normal circumstances, there will be some air leakage between the item and the suction cup. The airtightness between the item and the suction cup is a key factor affecting the adsorption effect and even determining the success or failure, and must be handled well.
The magnitude of the adsorption force is theoretically related only to the vacuum degree of the pump and the suction cup area, and is independent of the flow rate of the pump, but is related to the flow parameter of the pump in actual use. The reason is as follows: because it is impossible to make an absolute seal between the suction cup and the sucked object, there is always a slight leak. In this case, the larger the flow rate of the micro vacuum pump, the smaller the proportion of the leakage, and the better. Maintain a higher degree of vacuum to achieve greater adsorption. For example, there are two pumps with the same degree of vacuum. The flow rate of the A pump is 1 L/min, and the flow rate of the B pump is 20 L/min. Also in the case of a leakage of 0.5 L/min, the vacuum of the A pump is much lower because A 0.5 L/min leak accounts for 50% of the flow for the A pump, which is too large. However, the leakage of 0.5 L/min only accounts for 2.5% of the flow of the B pump. What is not the case, the suction cup can still maintain a high vacuum. Therefore, although the vacuum is the same, in practice, the B pump produces a greater adsorption force. Therefore, when selecting the pump, it is necessary to consider both the vacuum degree and the flow rate. It is not enough to only pay attention to the vacuum degree index.
The release problem after the object is sucked. After the pump is stopped, the object does not necessarily fall off immediately, because the pump has a certain pressure holding capacity, and the vacuum will continue to be maintained for a while. To release immediately, a pressure relief branch is added between the pump and the suction cup. A valve is connected to the branch, the valve is opened to deflate, and the vacuum of the pneumatic system is eliminated, so that the object can be reliably released.
Although the micro vacuum pump is oil-free and is not afraid to extract humid gas, the extracted gas must be clean and dust-free. It is required to install a filter, otherwise the accumulation of dust in the pump will cause the suction to decrease.
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