Analysis of the pumping principle of vacuum packaging machine

Low temperature pumping is a fast and effective method to obtain a clean vacuum environment. Cryopumps have high pumping speed and are usually used in vacuum systems that cannot be baked and degassed at high temperatures. From the perspective of the structure of the pumping system, the cryopump system is similar to the ion pump system. For pollution-free rough vacuuming, an adsorption pump can also be connected. But this combination is not suitable for pumping out large quantities of inert gases such as argon. Also, although cryopanels are easy to pump, when the cryopump needs to be regenerated, it will cause difficulties for the adsorption pump. Since the foreline pump is only used during initial pump down, contamination is minimal. The cryopump pumping system does not need a fore pump, but only a rough pump. The vacuum chamber of cryogenic pumping is pumped with a rough pump before reaching the switching pressure. When the switching pressure is reached, close the roughing valve and open the high vacuum valve. The vacuum chamber can be converted to cryopump pumping within a safe pressure range. If a mechanical pump is used for roughing, the minimum pressure allowed for the transition of the vacuum chamber to cryopump pumping is determined by the requirement to prevent the mechanical pump from returning oil. The cryogenic pumping surfaces of the pump should have a considerable heat capacity, and they will be able to accommodate 'bursts' of gas without irreversible heating. The vacuum pump is used in the automatic vacuum packaging machine. The vacuum preservation mainly means that the food is in a vacuum atmosphere, with little oxygen, and the food preservation degree and shelf life are high. It can also be vacuum inflated. Advantageously, the gas filled into the packaging container can not only inhibit the growth of mold, but also play a buffering effect on external extrusion.

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