Comparison of vacuum generator and micro vacuum pump

"Micro vacuum pump" and "vacuum generator" are two kinds of devices with the same function. The main difference is that the micro vacuum pump uses electricity, and the vacuum generator uses compressed air to generate vacuum.

Where there is already compressed air, it is a good solution to use a vacuum generator to obtain vacuum, and where there is no compressed air, it is more convenient to obtain a vacuum using a micro vacuum pump. Solution with vacuum generator.

Mini vacuum pumps, micro air pumps, and micro negative pressure pumps are oil-free and maintenance-free, and can be widely used in industrial automation equipment such as manipulators, chip adsorption devices, and printing machinery. These oil-free micro vacuum pumps can be found on Chengdu Xinweicheng Technology website.

The mini vacuum pump and vacuum suction cup are used to adsorb items. The following models are used most:

Type number

Adsorption force per square centimeter
(Theoretical value)

Flow (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 force” 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 (practically 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 the key factor that affects the adsorption effect and even determines the success or failure, and must be dealt with.

The size of the adsorption force is theoretically only related to the vacuum degree of the pump and the area of ​​the suction cup, but not to the flow rate of the pump, but in actual use it is related to the flow rate parameter of the pump. The reasons are as follows: because it is impossible to achieve an absolute seal between the suction cup and the suctioned object, there is always a little air leakage. In this case, the larger the flow rate of the micro vacuum pump, the smaller the proportion of the leakage amount, the more beneficial Maintain a higher degree of vacuum, thereby obtaining greater adsorption. For example, there are two pumps with the same vacuum degree, the flow rate of pump A is 1 L / min, and the flow rate of pump B is 20 L / min. Also in the case of a leakage of 0.5 L / min, the vacuum degree of pump A will be reduced because The leakage of 0.5 L / min occupies 50% of the flow rate for the A pump, which is too large. But the 0.5 L / min leakage accounts for only 2.5% of the flow rate for the B pump, which is nothing, the suction cup can still maintain a high vacuum. Therefore, although the vacuum degree of the two is the same, in practice, the suction force generated by the B pump is greater. Therefore, the two indexes of vacuum degree and flow rate must be considered at the same time when selecting the pump. It is not enough to only pay attention to the index of vacuum degree.

Regarding the release of objects after being sucked. After the pump is stopped, the object may not immediately fall off, because the pump has a certain pressure holding capacity, and the vacuum will continue to be maintained for a while. For immediate release, a pressure relief branch must be added between the pump and the suction cup. A valve should be connected to the branch to open the valve to relieve air and eliminate the vacuum in the pneumatic system, so that objects can be released reliably.

Although the micro-vacuum pump is oil-free and is not afraid of extracting wet gas, the extracted gas must be clean and dust-free, and it is required to install a filter, otherwise the accumulation of dust in the pump will cause the suction power to decrease. The oil-free micro vacuum pumps described above can be found on the Chengdu Xinweicheng Technology website.