Suction Filters: The First Line of Defense for Hydraulic Systems
Suction filters are installed on the suction pipe section of the pump. Like a loyal "gatekeeper", they intercept pollutants and ensure stable oil suction by the pump. They must have the characteristics of low resistance, large dirt holding capacity, and long clogging life. Usually, the filter elements are made of woven mesh or metal wire winding materials, and the filter layer area and mesh should be as large as possible to ensure that the pump is not worn prematurely.
Application in Construction Machinery
In equipment such as excavators and cranes, suction filters can effectively protect the oil pump from contamination by construction site dust and metal debris, allowing the equipment to work normally in harsh environments.
Application in Precision Hydraulic Systems
For equipment with extremely high requirements for oil cleanliness, such as machine tools and injection molding machines, suction filters with low-resistance filter materials (such as notched metal wires) are needed to provide stable support for precise processing and injection molding processes.
High-pressure Filters: A Solid Fortress to Meet High-pressure Challenges
High-pressure filters for pressure pipelines have a more complex structure than suction filters, consisting of a filter head, filter cartridge, and filter element, and sometimes equipped with a bypass valve and a transmitter. They work under high pressure, 承受 the pulsating impact of the pump and high-pressure fluctuations, and have extremely high requirements for material strength.
Misunderstanding 1: High-precision Suction Filters Are Not Omnipotent
Many people think that choosing a high-precision suction filter can not only effectively protect the pump but also ensure the cleanliness of the system. In fact, this is not the case. High-precision suction filters are easy to clog due to bearing too many pollutants, resulting in poor oil suction by the pump or even oil suction, accelerating pump wear and seriously threatening system safety.
Misunderstanding 2: Rated Flow ≠ Actual Flow
If the filter is selected according to a 1:1 ratio of rated flow to actual flow, the resistance of the oil passing through the filter will quickly reach the alarm value of the pollution clogging transmitter, requiring frequent cleaning or replacement of the filter element, increasing costs. Generally speaking, the rated flow of suction and return line filters should be more than 3 times the actual system flow; the rated flow of pipeline filters should be more than 2.5 times the actual system flow. If special oil is used, remember to consult the manufacturer for selection.
Misunderstanding 3: Filtration Accuracy ≠ Absolute Filtration
Some people think that a filter element with a filtration accuracy of (Xμm) can filter out all particles larger than its accuracy, which is wrong. Filtration accuracy is determined according to the filtration ratio. For the same filtration accuracy, due to different actual βx values, the filtration efficiency of the filter elements varies greatly.
Misunderstanding 4: Higher Accuracy Is Not Necessarily Better
Using high-precision filters to control pollution can improve the filtration effect, but it will increase the system manufacturing cost, shorten the service life of the filter element, and is not the best choice.
