The ornamental design for a hydrocyclone, as shown and described.
FIG. 1 is a side elevational view of a hydrocyclone embodying our new design, the opposite side elevational view being the same as that of FIG. 1, except for the absence or presence of details as indicated in FIG. 3;
FIG. 2 is a front elevational view of the hydrocyclone of FIG. 1, the rear elevational view being the same as that of FIG. 2, except for the absence or presence of details as indicated in FIG. 3;
FIG. 3 is an enlarged bottom plan view of the hydrocyclone of FIG. 1;
FIG. 4 is an enlarged top plan view of the hydrocyclone of FIG. 1; and,
FIG. 5 is an enlarged perspective view of the hydrocyclone head of the hydrocyclone of FIG. 1.
The broken line showing is for environmental purposes only and forms no part of the claimed design.