Patent EP-1780176-A1 (EP)
Inventor: HUYMANN ELMAR
IPC: C02F1/34
Filed: 2006-10-05
Abstract: The device for destroying viruses or bacteria contained in drinking water or industrial water by a hydrodynamic cavitation field or supercavitation field, has a housing, an inlet opening, an exit port for discharge, and a flow chamber arranged between the inlet opening and exit port with disk-shaped obstacles, which are arranged in the flow chamber and whose plane lies transverse to the primary flow direction (10). A flow split is arranged between the edges of the obstacle and the housing. The device for destroying viruses or bacteria contained in drinking water or industrial water by a hydrodynamic cavitation field or supercavitation field, has a housing, an inlet opening, an exit port for discharge, and a flow chamber arranged between the inlet opening and exit port with disk-shaped obstacles, which are arranged in the flow chamber and whose plane lies transverse to the primary flow direction (10). A flow split is arranged between the edges of the obstacle and the housing. The obstacles have edges with a sharp contour. The surfaces of the flow split measured transverse to the primary flow direction, decrease in the primary flow direction. In the flow direction after the inlet opening and before the first obstacle, a cone-shaped cross-sectional contraction and subsequently a cone-shaped cross-sectional expansion are present. The first obstacle is formed as an impact plate, which is concavely designed on the impact side aligned opposite to the primary flow direction. The device produces a pressure drop of 2.5-3 bar over the entire length. A path line with constant cross-section, is intended between the cross-section expansion and the impact plate. The exit port leads out radially from the housing that is arranged in the primary flow direction. The obstacles are axially adjustable by an axial misalignment of the central supply line, which is connected with the obstacle, or are axially adjustable relative to the central axis (15). The disk-shaped obstacles are oscillated in the flow direction. The flow split is present between the outer circumference of the disk-shaped obstacles and the surrounding housing. The disk-shaped obstacles are radially connected at a outer end with the housing. The contour edges of the obstacle exhibit a large dimensional length and are formed with a curved or serrated contour, viewed either in the axial direction or transverse direction to the axial direction. The internal contour of the surrounding housing exhibits a waved or serrated contour. The cross-sectional contraction is so dimensioned that the low velocity at the beginning of the cross-sectional contraction corresponds to the flow velocity at the last obstacle or is so dimensioned that the flow velocity at the narrowest place of the cross-sectional contraction is 5-20 % higher than the flow velocity at the last obstacle. The obstacles are identical disks with constant diameter along the primary flow direction and the housing wall proceeds with the same radial distance to the outer edges of the disks. The radial distance of the outer edge of the disks to the housing, decreases along the primary flow direction. The flow velocity increases by a factor of 10.5-11.5. The obstacles are positioned and dimensioned relative to one another and/or to the surrounding housing in such a manner that the flow velocity in the flow split of the last obstacle, increases by a factor of 2.0-2.3. The disks are positioned and dimensioned relative to one another and/or to the surrounding housing (2) in such a manner that the flow velocity in the respective flow split increases from an obstacle to the next in the flow direction in each case by a factor of 1.1-1.4. The number of obstacles is 5-7 and the axial thickness of the disks is 2-3 mm. The axial distance between the centers of two adjacent disks is three- to five-times of the disk thickness. The radial width of the annular gap between the disk-shaped obstacles and their housing is 1.5-3.8 mm. The axial length of the path line corresponds to 0.7-1.4-times the diameter of the flow chamber. The inner free diameter of the flow chamber corresponds to 0.9-1.1-times the free cross-section of the inlet- and/or discharge-pipe line. The free cross-section of the flow chamber is 1-2-times the free diameter of the inlet- and/or discharge-pipe line. The first and the second obstacle exhibit a substantially larger axial extension than the remaining disk-shaped obstacles and exhibit a circularly concave recess on their outer circumference. The contour edges exhibit a cross-sectional angle of smaller than 45[deg]. The disk-shaped obstacles are mountable only as a group in the longitudinal direction along the central axis. The first obstacle with its first contour edge in the flow direction lies in the region of the constant inside diameter of the housing and the second outline edge lies within the axial region of the tapering inside diameter of the housing. The disk-shaped obstacles with thickness of lesser than 3 mm, exhibit a straight lateral line at their external margin running parallel to the longitudinal axis or to the housing wall. An independent claim is included for procedure for destroying viruses or bacteria contained in drinking water or industrial water using the above device.