Selection criteria and skills of oil filters

Selection criteria and skills of oil filters

The quality of hydraulic oil has a great influence on the working performance of the hydraulic system. Many faults are rooted in it. To prevent oil contamination, install a hydraulic oil filter in an appropriate place to trap the contaminants in the oil and keep the oil clean. , To ensure the normal operation of the oil system.

　　 Hydraulic oil filter can be divided into surface type, depth type and magnetic filter according to the filter material. Their filtering effect on solid contaminants is accomplished by direct blocking and adsorption.

　　 The main function of the hydraulic oil filter is to filter the hydraulic oil, and various impurities inevitably appear in the hydraulic system. The main sources are: mechanical impurities remaining in the hydraulic system after cleaning, such as scale, casting sand, welding slag, iron filings, paint, paint and cotton yarn scraps, etc., and impurities that enter the hydraulic system from outside, such as through the fuel filler and Dust that enters the dust ring, etc.; impurities generated during the working process, such as the fragments formed by the hydraulic action of the seal, the metal powder produced by the relative wear of the movement, the colloid, asphaltene, carbon residue, etc. produced by the oil due to oxidative deterioration . After the above-mentioned impurities are mixed into the hydraulic oil, as the hydraulic oil circulates, it will cause damage everywhere, which will seriously affect the normal operation of the hydraulic system, such as making a small gap (in terms of) between relatively moving parts in hydraulic components and throttling Small holes and gaps are stuck or blocked; damage the oil film between relative moving parts, scratch the surface of the gap, increase internal leakage, reduce efficiency, increase heat generation, aggravate the chemical action of the oil, and make the oil deteriorate. According to production statistics, more than 75% of the faults in the hydraulic system are caused by impurities mixed in the hydraulic oil. Therefore, maintaining the cleanliness of the oil and preventing the contamination of the oil are very important for the hydraulic system.

　　 product selection

(1) When selecting a hydraulic oil filter, it can be based on the characteristics of the above-mentioned various filters, combined with the requirements of various typical hydraulic components and systems for pollution levels or filtration accuracy, system working pressure, oil temperature and oil Select the model of the filter based on the viscosity of the liquid.

　　 (2) The hydraulic oil filter must have sufficient flow capacity. Flow capacity refers to the maximum flow allowed through the filter under a certain pressure drop. It should be selected according to the filter sample according to the installation position of the filter in the system.

　　 (3) The hydraulic oil filter must have a certain degree of mechanical strength and not be damaged by hydraulic pressure.

　　 (4) For hydraulic systems that cannot be stopped, a filter with a switching structure must be selected. The filter element can be replaced without stopping the machine. For occasions that require the filter element to be blocked and alarm, you can choose a filter with a signaling device.