The ornamental design for a portable dustcollector, as shown and described.
FIG. 1 is a front perspective view of a portable dust collector in accordance with our new design;
FIG. 2 is a rear perspective view of the portable dust collector in accordance with our new design;
FIG. 3 is a front elevational view of the portable dust collector in accordance with our new design;
FIG. 4 is a rear elevational view of the portable dust collector in accordance with our new design;
FIG. 5 is a top plan view of the portable dust collector in accordance with our new design;
FIG. 6 is a bottom plan view of he portable dust collector in accordance with our new design;
FIG. 7 is a right side elevational view of the portable dust collector in accordance with our new design;
FIG. 8 is a left side elevational view of the portable dust collector in accordance with our new design; and,
FIG. 9 is a front perspective view of the portable dust collector in accordance with our new design showing when a hose and a nozzle are attached to the portable dust collector.
The broken lines in FIGS. 5-8 depict portions of the portable dust collector that form no part of the claimed design. The broken lines in FIG. 9 depict environmental structures that form no part of the claimed design.