For normal operation of mechanisms and machines using various working fluids, the size of mechanical particles in it must be smaller than the gap in the moving pairs or the holes in the nozzles. In this regard, the working fluids are pre-filtered. Usually, two-stage filtration is used: first, coarse cleaning, and then fine cleaning. This work is devoted to improving the coarse cleaning system. There are known coarse cleaning filters in which the liquid is cleaned due to sludge. They are large-volume tanks with partitions. This circumstance sharply limits the scope of use of these filters. Mesh filters are of certain practical interest for coarse cleaning of working fluids, as they are more compact and convenient to use. For coarse cleaning of working fluids, only square-weave metal meshes are used, that is, metal meshes with a square mesh. To form a cylindrical working surface of the filter element, the flat metal mesh is not only bent, but also its ends are connected using additional parts or soldering. This increases the cost of manufacturing the filter element. In addition, to increase the productivity of the liquid pumped through the filter, the need to increase the area of the filter element can significantly increase the dimensions of the filter. The latter limits the scope of its use. As we can see, all the imperfections of this coarse filter are associated with the fact that its filter element has only one working surface (cylindrical). Therefore, further improvement of the filter is aimed at developing a filter element with an additional working surface. The purpose of the study is to reduce the cost of manufacturing and expand the scope of use of the filter. In the proposed new coarse liquid filter, the filter element is made of a flat metal mesh with a square mesh by the method of cold multi-operation drawing. Of all known metal meshes, only meshes with a square mesh are subject to this type of deformation, i.e. do not tear. After stretching, the filter element takes the form of a cylindrical cup with a small flange, which is used for fastening. An original technology for stretching a filter element from a square blank is proposed. This filter element, compared to the known one, has not only a side, but also a bottom working surface. The filter element is tightly put on a perforated support, which does not allow the mesh to bend under the pressure of the liquid being cleaned. The use of this filter allows you to reduce the cost of its manufacture by simplifying the technology for manufacturing the filter element, as well as expand the area of use of the filter due to the presence of not only a side, but also a bottom working surface in the filter element. The latter increases its throughput and makes it more compact.

coarse filter, filter element, metal mesh with square weave, working surface, drawing

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