69results about How to "Solve frequent replacement" patented technology

The invention discloses a return filter and a method of filtering fluid by using the return filter. The return filter comprises a filter cover, a filter head and a filter cartridge, wherein the filter head is arranged between the filter cover and the filter cartridge; an unframed filter element is arranged below the inner wall of the filter cartridge; a bypass valve is arranged at the upper end of the unframed filter element; a magnetic bar is arranged in the centers of the bypass valve and the unframed filter element. When the return filter is used, the fluid enters the filter head from an opening of the filter head, and enters an inner cavity of the unframed filter element by downwards flowing along an inner hole of the bypass valve; most metal particles in the fluid are absorbed by the magnetic bar, and a first level of purification of the fluid is completed; the fluid is filtered by the unframed filter element, and finally passes through holes in the filter cartridge to enter a container. The return filter and the method of filtering the fluid by using the return filter have the beneficial effects that the structural design is ingenious, the economic efficiency is improved, and the environment protection is reinforced; when the filter element is replaced and the fluid passes by the bypass valve, contaminants which are intercepted in the filter element cannot reflow to the container, and the service life of equipment is prolonged.