If we want to solve the cavitation problem of vacuum pump, Baidu has a large cost to reduce the water temperature, and it is more impossible to reduce the vacuum degree, that is to say, let the back pressure of condenser rise, which will seriously affect the load capacity of the unit. The ideal way is to solve the cavitation problem under the condition that the original water temperature and system vacuum remain unchanged. At present, the best choice is to add atmospheric ejector to the vacuum pump, the whole The extraction performance of the vacuum pump group will be better, so the vacuum of the condenser can still guarantee the current level or higher, but the internal vacuum degree of the vacuum pump body is only 12kpa (at this time, the system vacuum is within the range of 3-8kpa), which can effectively avoid the generation of cavitation.
The air jet pump consists:
The exhaust port is connected with the air inlet of the liquid ring pump.
Principle of air ejector:
First, start the liquid ring vacuum pump to form a pressure difference between the air inlet and the exhaust port of the nozzle. The air can enter the vacuum pump from the nozzle. When the pressure difference is 1 / 2 of the atmospheric pressure, the air medium can be accelerated through the contraction section of the nozzle. When it reaches the throat, it can reach the sound speed. When it reaches the expansion section, it can be further accelerated to the sound speed. It can shoot to the diffuser to form a high-speed jet, and cause the pressure ratio in the suction chamber to be pumped The pressure in the diffuser is low, so the extracted gas is sucked into the chamber. Because the two air streams are mixed in the suction chamber, the loss caused by momentum exchange slows down the gas flow rate gradually. When entering the throat of the diffuser, it drops below the sound speed. After further reducing through the diffuser expansion section, the pressure rises continuously, and finally reaches the exhaust pressure of the atmospheric ejector, i.e. the suction pressure of the liquid ring pump, the liquid ring pump pulls the gas Body suction and then discharge out of the vacuum pump, that is, to complete the process of suction and exhaust.
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