Filter device with filter element
AssigneeHydac Filtertechnik GmbH
InventorSebastian Fiedler
Life of this patent
Estimating the term…
Abstract
A filter device for filtering fluid particularly an aqueous urea solution, includes a filter housing (1), a filter element (11) and a compensating element (31) for compensating fluctuations in the pressure and/or volume of the fluid. At least one elastically-flexible membrane (31) serves as the compensating element. The membrane wall of of the membrane is held in a retaining part (35) and maintains a separation between the fluid and a compressible filling medium such as a working gas.
Claims19
A filter device for filtering fluid, the filter device comprising:
- a filter housing;
- a filter element in said filter housing;
- a compensating element in said filter housing capable of compensating for at least one of pressure or volume fluctuations of fluid in said filter housing, said compensating element having an elastically flexible first diaphragm with a diaphragm wall held in a retaining part and separating fluid in said filter housing outside of said compensating element from a compressible medium inside said compensating element;
- a partially fluid-permeable body being arranged on an outside of said first diaphragm and essentially following an outer contour of said first diaphragm;
- and
- a filler in said retaining part, said filler being capable of filling said compensating element with said compressible medium.
A filtering device for filtering fluids, the filtering device comprising:
- a filter housing;
- a filter element inside said filter housing;
- a compensating element in said filter housing capable of compensating for at least one of pressure or volume fluctuations of fluid in said filter housing, said compensating element having an elastically flexible and identical first and second diaphragms with diaphragm walls secured on opposite sides of a retaining part and separating fluid in said filter housing outside of said compensating element from a compressible gas inside said compensating element, said retaining part being hollow and receiving said compressible gas;
- and
- a filler in said retaining part, said filler being capable of filling said compensating element with said compressible medium.
A filter element for a filter device, the filter element comprising:
- a fluid pressure or volume compensating element having flexible first and second diaphragms having diaphragm walls held on opposite sides of a retaining part;
- a filler in said retaining part, said filler being capable of filling said first and second diaphragms with a compressible filling medium;
- and
- a filter medium enveloping said compensating element and extending between first and second end caps.
Dependencies are inferred from the claim text.