The difference between water injection screw compressor and oil injection screw machine

The difference between water injection screw compressor and oil injection screw machine is mainly reflected in the lubrication and cooling methods. The following is a specific analysis:

working principle:

water jet screw compressor: the rotor is cooled by water jet cooling. When the compressor is working, the water spray system will spray the cooling water on the rotor to cool the rotor. At the same time, the water also turns into steam, which is discharged with the air. In this way, the operation of the compressor is more stable and the cooling effect is better.

Fuel injection screw machine: Inject fuel into the engine in a certain proportion, and work by adjusting the combustion quality and efficiency of the fuel. It is mainly composed of a cast shell, cylinder heads on both sides, internal gears, screws, fuel injectors, transmission shafts and other components. When the screw rotates, the oil in the oil passage is squeezed through the geometric contour of the screw to form a certain pressure difference, so that the oil is injected into the inside through the fuel injection nozzle to realize the fuel injection.

Lubrication and cooling method:

water jet screw compressor: use water as cooling medium, directly injected into the cylinder for cooling. This method not only has a good cooling effect, but also is closer to isothermal compression, which makes the energy consumption lower. At the same time, the exhaust temperature can be controlled at a lower level (such as about 50 ℃), so there is no need to equip with an aftercooler.

Oil injection screw machine: the use of oil as a lubricant, oil in the compression process also played a certain cooling effect. However, the cooling effect may be slightly less than that of water spray cooling.

Applications and features:

water-jet screw compressor: It is especially suitable for compressing special gases with low critical points, and due to its efficient cooling system, it has advantages in certain applications that require strict temperature control.

Oil injection screw machine: widely used in refrigeration, refrigeration, air conditioning and chemical process and other refrigeration equipment. It has simple structure, few wearing parts, and can operate under the working conditions of large pressure difference or pressure ratio, and has good air transmission regulation.

In summary, the main difference between the water-injected screw compressor and the oil-injected screw machine lies in its working principle, lubrication and cooling methods, and application fields. Which type of compressor to choose depends on the specific application needs and scenarios.