lax pump working principle

The structure principle of the lax pump is that the bottom of the pump is a transpiration device, which stores the oil of the lax pump. The upper part is the air inlet, and the right side pipe is the port. During the operation, the front vacuum is supplied by the mechanical pump. When the oil is heated by an electric furnace, the steam of the oil will flow along the 

The flow pipe is ejected downward through the umbrella nozzle. Due to the vacuum (10-2 ~ 10-3 Torr) supplied by mechanical pump outside the nozzle, the oil steam can be ejected for a long interval and hooked into a jet moving towards the mouth. When the jet finally meets the wall of the vessel cooled by cooling water, it will form a liquid rest and flow back to the transpiration device for use from the beginning.

Once the gas molecules enter the pump from the inlet, once they fall into the steam flow, they get the moving maximum of downward movement and fly down. Because the jet has high velocity (about 200 meters per second), high steam density (steam pressure several to dozens of Torr), and the loose pump oil has high molecular weight (350-500), it can effectively remove gas molecules, so in the interface of the jet, gas molecules can not stay for a long time, and its concentration is very small. In other words, there is a large concentration difference between the two ends of the jet interface. It is this concentration difference that causes the power source of the pumped gas to jump over the interface, disperse into the jet and be taken to the outlet. There, they are taken away by mechanical pumps.

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