초록 ▼

A filtering device (100) for high-viscosity fluids has a partial channel (34) in the housing (30) and a displacing piston (40) which can be inserted into the partial channel (34, 35). The displacing piston (40) has at least one inner fluid line (42) that extends from an inlet opening (41) therein to

A filtering device (100) for high-viscosity fluids has a partial channel (34) in the housing (30) and a displacing piston (40) which can be inserted into the partial channel (34, 35). The displacing piston (40) has at least one inner fluid line (42) that extends from an inlet opening (41) therein to an outlet opening (43) on its circumference. The outer diameter of the displacing piston (40) corresponds to the inside diameter of the partial channel (34, 35). The displacing piston (40) can be positioned, in a production position, with its outlet opening (43) in front of the inlet of the discharge channel (33) into the partial channel (34, 35) and can be retracted to a backflushing initial position within the partial channel (34). Along a backflushing travel path of the displacing piston, the inlet of the discharge channel (33) into the partial channel (35) is covered by the outer wall of the displacing piston (40) and/or the outlet opening (43) of the displacing piston (40) is covered by the inner wall of the partial channel (34).

대표청구항 ▼

1. A filtering device for viscous fluids, said filtering device comprising: a housing;a screen carrier element movably supported in said housing, said screen carrier element having a screen space;a filter element disposed in said screen space, said screen space and said filter element each having a

1. A filtering device for viscous fluids, said filtering device comprising: a housing;a screen carrier element movably supported in said housing, said screen carrier element having a screen space;a filter element disposed in said screen space, said screen space and said filter element each having a dirty side and a clean side;a backwash channel in said housing, said backwash channel connected to said dirty side of said screen space;a partial channel in said housing, said partial channel having a linear partial section and an inner wall with an inner diameter;a discharge channel in said housing, said discharge channel having a discharge channel inlet and a discharge channel outlet, said partial channel configured to fluidly connect said clean side of said screen space to said discharge channel, said discharge channel branching off and extending away from said linear partial section at said discharge channel inlet; anda displacing piston disposed in said partial channel for movement between a production position and a backwash starting position, said displacing piston having a circumference defined by an outer wall with an outer diameter, said displacing piston having an inlet opening, an inner fluid line, and an outlet opening, said inner fluid line extending from said inlet opening to said outlet opening, said outlet opening located at said circumference of said displacing piston, said outer diameter of said displacing piston corresponding, at least in some regions, to said inner diameter of said partial channel, said displacing piston configured to move counter to a production fluid flow direction to press fluid located in said partial channel through said filter element and into said backwash channel, thereby moving such fluid counter to the production fluid flow direction,said displacing piston, when in said production position, has its outlet opening in fluid communication with said discharge channel inlet, andsaid displacing piston configured to move along a backwash travel path into a backwash starting position to accumulate fluid inside said partial channel, and when said displacing piston is in said backwash starting position said discharge channel inlet is covered by said outer wall of said displacing piston or said outlet opening of said displacing piston is covered by said inner wall of said partial channel. 2. The filtering device of claim 1, wherein said displacing piston has a face side, and said displacing piston is not moveable counter to the production fluid flow direction beyond its location when in said production position. 3. The filtering device of claim 1, wherein said inlet opening of said displacing piston is located at said circumference of said displacing piston. 4. The filtering device of claim 1, wherein said displacing piston has a face side, and said inlet opening of said displacing piston is located at said face side of said displacing piston. 5. The filtering device of claim 1, wherein said inlet opening is located at an end section of said displacing piston, and said outlet opening is located at a center section of said displacing piston, said displacing piston comprising a single continuous cylindrical wall that forms both said end section and said center section of said displacing piston. 6. The filtering device of claim 1, wherein said housing has a bore hole, said screen carrier element has a cylindrical shape, and said screen carrier element is movably disposed in said bore hole of said housing. 7. The filtering device of claim 1, wherein said screen carrier element includes a second screen space. 8. The filtering device of claim 1, further comprising a second screen carrier element, a second displacing piston, and a second partial channel, said second screen carrier element being movably supported in said housing, said second displacing piston disposed in said second partial channel for movement between a production position and a backwash starting position. 9. The filtering device of claim 6, wherein said displacing piston has a face side with a curvature that matches a radius of said cylindrical shape of said screen carrier element. 10. The filtering device of claim 1, wherein said screen carrier element is a screen wheel that is rotatably supported in said housing and that has multiple screen spaces arranged on a partial circle. 11. The filtering device of claim 1, wherein said discharge channel extends along an axis that forms an angle α in the range of 120° to 150° with an axis along which said partial channel extends. 12. The filtering device of claim 1, wherein said housing has a vertical housing axis, and said partial channel extends along an axis that is offset at an angle in the range of 30° to 60° from said vertical housing axis. 13. A filtering device for viscous fluids, said filtering device comprising: a housing;a screen carrier element movably supported in said housing, said screen carrier element having a screen space;a filter element disposed in said screen space, said screen space and said filter element each having a dirty side and a clean side;a backwash channel in said housing, said backwash channel connected to said dirty side of said screen space;an additional housing;a fluid reservoir in said additional housing, said fluid reservoir having a linear partial section;a partial channel in said housing, said partial channel extending from a first end to a second end, said first end connected to said clean side of said screen space and said second end connected to said additional housing;a discharge channel in said additional housing and having a discharge channel inlet and a discharge channel outlet, said discharge channel inlet connected to said fluid reservoir, said discharge channel branches off and extends away from said fluid reservoir, said discharge channel outlet configured to discharge flow from said housing; anda displacing piston disposed in said fluid reservoir for movement between a production position and a backwash starting position, said displacing piston having a circumference defined by an outer wall with an outer diameter, said displacing piston having an inlet opening, an inner fluid line, and an outlet opening, said inner fluid line extending from said inlet opening to said outlet opening, said outlet opening located at said circumference of said displacing piston, said outer diameter of said displacing piston corresponding, at least in some regions, to said inner diameter of said fluid reservoir, said displacing piston configured to move counter to a production fluid flow direction to press fluid located in said fluid reservoir through said filter element and into said backwash channel, thereby moving such fluid counter to the production fluid flow direction,said displacing piston, when in said production position, has its outlet opening in fluid communication with said discharge channel inlet, andsaid displacing piston configured to move along a backwash travel path into a backwash starting position to accumulate fluid inside said fluid reservoir, and when said displacing piston is in said backwash starting position said discharge channel inlet is covered by said outer wall of said displacing piston or said outlet opening of said displacing piston is covered by said inner wall of said fluid reservoir. 14. The filtering device of claim 13 wherein said partial channel in said housing opens to an inlet of a section of partial channel in said additional housing. 15. The filtering device of claim 14, further comprising a blocking element that closes one end of said fluid reservoir, a redirection channel, said section of partial channel in said additional housing opening to said redirection channel in said blocking element. 16. The filtering device of claim 15, wherein said redirection channel in said blocking element opens to said fluid reservoir at said face of said blocking element. 17. The filtering device of claim 15, wherein said displacing piston, when in said production position, is positioned such that no gap exists between a face side of said displacing piston and a face surface of said blocking element, and wherein when said displacing piston is in said backwash starting position a gap is formed between said face side of said displacing piston and said face surface of said blocking element. 18. The filtering device of claim 13, wherein said housing and said additional housing are formed by a single block.