New type filter for screw compressor-oil bath air filter

In the environment with high dust concentration in the air, the dust removal filter device used by the screw compressor is mostly paper or fiber material. The accumulation of dust particles is easy to block, and frequent shutdowns are required to replace filter materials. This results in high cost of materials and accessories, low equipment use efficiency, and increased labor intensity. Aiming at the comparison of the commonly used paper and fiber filters; we provide a new type of high-efficiency zkdg oil-bath air filter that integrates cyclone, oil bath, oil film and filter screens and other dust removal methods, which plays an excellent role . Dust filtration efficiency>98%, filtration accuracy<5µ., resistance<30mm water column. Significantly reduce the cost of materials and accessories, and reduce maintenance workload. It greatly prolongs the compressor life cycle and is very popular among users.

Schematic diagram of filter principle structure

The filter is cylindrical, and the cylinder is divided into three parts: the outer cylinder, the inner cylinder, and the air outlet pipe. The upper part of the inner part is a swirl plate (or guide vane) and a filter screen, and the lower part is connected to the outer cylinder, and the bottom of the cylinder is filled with compressor oil (waste oil). Air is sucked into the outer cylinder from the tangential direction and rotates at a high speed. The dust particles in the airflow are separated by centrifugal force. Then the air flow traverses the oil surface, and the oil surface fluctuates. Part of the oil mist is entrained and rotated by the air flow and adheres to the inner cylinder wall to form an oil film. The dust particles in the air flow are captured by the oil film. The oil film flows back along the wall and becomes a drooping oil curtain. When the air passes through the oil bath, some dust particles are captured. The air flow rotates and rises in the inner cylinder, passes through the swirl plate and then intensifies the rotation, throws a part of the oil droplets entrained in the air flow into the oil return groove and flows into the bottom of the cylinder through the oil return pipe, and part of it flows back along the inner cylinder wall to coat the oil film on the cylinder wall. The collected dust is washed down to the bottom of the cylinder, producing a new oil film. Then the airflow passes through the filter again to filter out smaller dust particles and oil droplets, achieving the purpose of filtering the air.

As shown in the figure, the air flow path is A-B-C-D-E-F.