Types Of Jet Pump Applications

The working fluids of the jet pump can be both gases (air or steam) and liquids. Common ones are water vapor jet pumps, air jet pumps, and water jet pumps. There is also a kind of jet pump that uses oil as the medium, namely the oil diffusion pump and the oil booster pump, which is the main equipment used to obtain high vacuum or ultra-high vacuum.

Water vapor jet pump
The water vapor jet pump is a kind of jet vacuum pump that uses water vapor as the working medium and can directly exhaust the atmosphere. This pump has a fast start, a small footprint, a wide working pressure range, and a large pumping capacity, which can pump out dusty, corrosive, flammable and explosive gases. It is more economical to use surplus or waste steam. The disadvantages of this pump are high civil construction investment (some installation heights need to be more than 10m) and large cooling water consumption. The compression ratio of a single-stage water vapor jet pump generally does not exceed 10.

Air jet pumps
The air jet pump uses compressed air or atmospheric pressure air as the working medium. Air or other gases are sucked in by a stream of air that creates low pressure at the outlet of the nozzle and then compresses it and discharges it. According to whether the working medium is high-pressure air or atmospheric air, it is divided into general air jet pump and atmospheric jet pump. The working medium consumption of the air jet pump is large, and it must have an air compressor with a large capacity. Generally, most air jet pumps are single-stage.

Water jet pumps
When the required vacuum level is not too high, a water jet pump with a certain pressure of water as the working fluid can be used to create a vacuum. The velocity of the water jet is usually around 15-30 m/s. It belongs to rough vacuum equipment. Water jet pumps are used in a wide range of applications due to their dual role in generating vacuum and condensing steam.