Kunshan Shunfeng purification introduction: The reason of PP filter being sucked flat analysis

Precision filter is a kind of filter widely used in water treatment industry, its shell is usually made of stainless steel material, built-in single or multiple filters, under the action of pressure, so that the stock liquid through the filter material, filter residue left on the tube wall, filtrate through the filter material outflow, to achieve the purpose of filtration. Because the filter material is different, the filter aperture is also different, and the filter aperture is generally in the range of 0.5~120μm.

The working principle of PP filter is used for mechanical filtration with 5 micron holes. The surface and pores of the filter element capture or adsorb trace particles, colloids and microorganisms remaining in the water.

Under the action of pressure, the safety filter of the water treatment equipment makes the liquid pass through the filter material, the filter residue remains on the pipe wall, and the filtrate flows out through the filter material, so as to achieve the purpose of filtration. Because of the different filter materials, the filter aperture is also different. With the increase of water production time, the movement resistance of the filter element gradually increases due to the interception of pollution. When the inlet and outlet water pressure reaches 0.1MPa, the filter element should be replaced. There are many kinds of filter elements, such as folding filter, wire wound filter, large flow filter, activated carbon filter and so on.

If the water treatment equipment is not cleaned and replaced in time, the resistance of raw water through the filter element will increase. During the operation of the high pressure pump, the safety filter is in a vacuum state, resulting in a flat filter element. Insufficient skeleton support, poor compression capacity, slightly high pressure, and flat filter element. The pressure difference between the inlet and outlet of the precision filter is 0.1-0.15MPa and should be replaced within 3-4 months.

When the precision of the filter element is not appropriate, not all systems are suitable for high-precision filters. When the water quality is poor, the diameter of the selected filter element is too high or the pressure exceeds the allowed high working pressure, which will also lead to the flattening of the filter element.

Usually installed in front of the pressure vessel, the safety filter can remove turbidity particles of more than 1 degree, so that the water intake meets the water intake requirements of the equipment. However, the filter element will become flat after a period of use, the main reason is:

1. The use time of filter element is long enough, and it is not replaced in time

If it is not cleaned and replaced in time, the resistance of raw water through the filter element increases, and the vacuum state of the safety filter occurs during the working process of the high pressure pump, resulting in the flat filter element.

The import and export pressure difference of the precision filter is generally 0.1-0.15mpa replacement, and it is usually replaced within 3-4 months.

2. Insufficient support of filter core skeleton

The skeleton support is insufficient, the pressure resistance is poor, the pressure is slightly large, and the filter element atrophies.

3. Improper selection of filter element and inappropriate filtration accuracy

The filtration accuracy is not suitable, and not all systems are suitable for filter elements with high filtration accuracy. If the water quality is poor, the filter bore is too high or the pressure exceeds the maximum allowable working pressure, it will also cause the filter to be flat.

4. The water inlet pressure is inappropriate

The fluctuation of inlet pressure will also cause the filter element to suck flat.

To sum up: it leads to the flattening of the filter element and seriously affects the water purification effect. When selecting the filter element, the working conditions of the filter element should be comprehensively considered, the appropriate filter type and accuracy should be selected, and replaced in time to ensure the accuracy of the outlet water and the service life of the rear film element.