The ornamental design for a dustcollector for vacuumcleaner, as shown and described.
1. Dust collector for vacuum cleaner
1.1 is a perspective view of a dust collector for vacuum cleaner showing our new design;
1.2 is a front elevation view thereof;
1.3 is a rear elevation view thereof;
1.4 is a left-side elevation view thereof;
1.5 is a right-side elevation view thereof;
1.6 is a top plan view thereof;
1.7 is a bottom plan view thereof; and
1.8 is a perspective view thereof in a use condition.
The broken line showing of portions of the dust collector for vacuum cleaner is for the purpose of illustrating environment and forms no part of the claimed design.